| roach | (noun) any of numerous chiefly nocturnal insects; some are domestic pests | Synonyms: cockroach |
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| (noun) European freshwater food fish having a greenish back | Synonyms: Rutilus rutilus |
| (noun) the butt of a marijuana cigarette | - |
| (noun) street names for flunitrazepam | Synonyms: circle, forget me drug, Mexican valium, R-2, roofy, rope, rophy |
| (noun) a roll of hair brushed back from the forehead | - |
| (verb) cut the mane off (a horse) | - |
| (verb) comb (hair) into a roach | - |
| road | (noun) a way or means to achieve something | - |
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| (noun) an open way (generally public) for travel or transportation | Synonyms: route |
| roadbed | (noun) a bed supporting a road | - |
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| roadblock | (noun) a barrier set up by police to stop traffic on a street or road in order to catch a fugitive or inspect traffic etc. | Synonyms: barricade |
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| (noun) any condition that makes it difficult to make progress or to achieve an objective | Synonyms: barrier |
| roadbook | (noun) a guidebook describing the roads of a country; contains maps and (sometimes) a gazetteer | - |
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| roadhog | (noun) a driver who obstructs others | Synonyms: road hog |
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| roadhouse | (noun) an inn (usually outside city limits on a main road) providing meals and liquor and dancing and (sometimes) gambling | - |
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| roadkill | (noun) the dead body of an animal that has been killed on a road by a vehicle | - |
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| roadless | (adjective) lacking pathways | Synonyms: pathless, trackless, untracked, untrod, untrodden |
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| roadman | (noun) a salesman who travels to call on customers | Synonyms: bagman, commercial traveler, commercial traveller, traveling salesman, travelling salesman |
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| (noun) a workman who is employed to repair roads | Synonyms: road mender |
| roadrunner | (noun) speedy largely terrestrial bird found from California and Mexico to Texas | Synonyms: chaparral cock, Geococcyx californianus |
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| roads | (noun) a partly sheltered anchorage | Synonyms: roadstead |
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| roadside | (noun) edge of a way or road or path | Synonyms: wayside |
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| roadstead | (noun) a partly sheltered anchorage | Synonyms: roads |
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| roadster | (noun) a small lightweight carriage; drawn by a single horse | Synonyms: buggy |
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| (noun) an open automobile having a front seat and a rumble seat | Synonyms: runabout, two-seater |
| roadway | (noun) a road (especially that part of a road) over which vehicles travel | - |
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| roadworthiness | (noun) (of motor vehicles) the quality of being fit to drive on the open road | - |
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| roam | (verb) move about aimlessly or without any destination, often in search of food or employment | Synonyms: cast, drift, ramble, range, roll, rove, stray, swan, tramp, vagabond, wander |
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| roamer | (noun) someone who leads a wandering unsettled life | Synonyms: bird of passage, rover, wanderer |
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| roan | (adjective) (used of especially horses) having a brownish coat thickly sprinkled with white or grey | - |
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| (noun) a horse having a brownish coat thickly sprinkled with white or gray | - |
| (noun) a soft sheepskin leather that is colored and finished to resemble morocco; used in bookbinding | - |
| roar | (noun) a very loud utterance (like the sound of an animal) | Synonyms: bellow, bellowing, holla, holler, hollering, hollo, holloa, roaring, yowl |
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| (noun) a deep prolonged loud noise | Synonyms: boom, roaring, thunder |
| (noun) the sound made by a lion | - |
| (verb) laugh unrestrainedly and heartily | Synonyms: howl |
| (verb) make a loud noise, as of wind, water, or vehicles | Synonyms: howl |
| (verb) emit long loud cries | Synonyms: howl, ululate, wail, yaup, yawl |
| (verb) utter words loudly and forcefully | Synonyms: thunder |
| (verb) make a loud noise, as of animal | Synonyms: bellow |
| (verb) act or proceed in a riotous, turbulent, or disorderly way | - |
| roarer | (noun) someone who communicates vocally in a very loud voice | Synonyms: bawler, bellower, screamer, screecher, shouter, yeller |
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| roaring | (adjective) very lively and profitable | Synonyms: booming, burgeoning, flourishing, palmy, prospering, prosperous, thriving |
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| (noun) a very loud utterance (like the sound of an animal) | Synonyms: bellow, bellowing, holla, holler, hollering, hollo, holloa, roar, yowl |
| (noun) a deep prolonged loud noise | Synonyms: boom, roar, thunder |
| (adverb) extremely | - |
| roast | (adjective) (meat) cooked by dry heat in an oven | Synonyms: roasted |
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| (noun) negative criticism | Synonyms: knock |
| (noun) a piece of meat roasted or for roasting and of a size for slicing into more than one portion | Synonyms: joint |
| (verb) cook with dry heat, usually in an oven | - |
| (verb) subject to laughter or ridicule | Synonyms: blackguard, guy, jest at, laugh at, make fun, poke fun, rib, ridicule |
| roasted | (adjective) (meat) cooked by dry heat in an oven | Synonyms: roast |
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| roaster | (noun) a special cooking pan for roasting | - |
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| (noun) flesh of a large young chicken over 3 1/2 lb suitable for roasting | - |
| (noun) a cook who roasts food | - |
| (noun) a harsh or humorous critic (sometimes intended as a facetious compliment) | - |
| roasting | (noun) cooking (meat) by dry heat in an oven (usually with fat added) | - |
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| rob | (verb) take something away by force or without the consent of the owner | - |
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| (verb) rip off; ask an unreasonable price | Synonyms: fleece, gazump, hook, overcharge, pluck, plume, soak, surcharge |
| robalo | (noun) a kind of percoid fish | - |
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| robber | (noun) a thief who steals from someone by threatening violence | - |
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| robbery | (noun) larceny by threat of violence | - |
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| (noun) plundering during riots or in wartime | Synonyms: looting |
| robe | (noun) any loose flowing garment | - |
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| (noun) outerwear consisting of a long flowing garment used for official or ceremonial occasions | Synonyms: gown |
| (verb) clothe formally; especially in ecclesiastical robes | Synonyms: vest |
| (verb) cover as if with clothing | Synonyms: cloak, clothe, drape |
| robed | (adjective) dressed or clothed especially in fine attire; often used in combination | Synonyms: appareled, attired, dressed, garbed, garmented, habilimented |
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| robin | (noun) large American thrush having a rust-red breast and abdomen | Synonyms: American robin, Turdus migratorius |
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| (noun) small Old World songbird with a reddish breast | Synonyms: Erithacus rubecola, Old World robin, redbreast, robin redbreast |
| roble | (noun) tall graceful deciduous California oak having leathery leaves and slender pointed acorns | Synonyms: California white oak, Quercus lobata, valley oak, valley white oak |
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| (noun) large tree of Trinidad and Guyana having odd-pinnate leaves and violet-scented axillary racemes of yellow flowers and long smooth pods; grown as a specimen in parks and large gardens | Synonyms: Platymiscium trinitatis |
| robocall | (noun) An phone call made by an automated service | - |
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| robot | (noun) a mechanism that can move automatically | Synonyms: automaton, golem |
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| robotic | (adjective) of or relating to mechanical robots | - |
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| (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, automatonlike, machinelike, robotlike |
| robotics | (noun) the area of AI concerned with the practical use of robots | - |
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| robotlike | (adjective) resembling the unthinking functioning of a machine | Synonyms: automatic, automatonlike, machinelike, robotic |
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| robust | (adjective) sturdy and strong in form, constitution, or construction | - |
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| (adjective) strong enough to withstand or overcome intellectual challenges or adversity | - |
| (adjective) marked by richness and fullness of flavor | Synonyms: full-bodied, racy, rich |
| (adjective) rough and crude | - |
| robustious | (adjective) noisy and lacking in restraint or discipline | Synonyms: boisterous, rambunctious, rumbustious, unruly |
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| robustly | (adverb) in a robust manner | - |
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| robustness | (noun) the property of being strong and healthy in constitution | Synonyms: hardiness, lustiness |
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| (noun) the characteristic of being strong enough to withstand intellectual challenge | - |
| roc | (noun) mythical bird of prey having enormous size and strength | - |
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| rocambole | (noun) European leek cultivated and used like leeks | Synonyms: Allium scorodoprasum, giant garlic, sand leek, Spanish garlic |
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| roccella | (noun) a source of the dye archil and of litmus | Synonyms: Roccella tinctoria |
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| rock | (noun) pitching dangerously to one side | Synonyms: careen, sway, tilt |
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| (noun) a genre of popular music originating in the 1950s; a blend of black rhythm-and-blues with white country-and-western | Synonyms: rock-and-roll, rock'n'roll, rock 'n' roll, rock and roll, rock music |
| (noun) hard bright-colored stick candy (typically flavored with peppermint) | Synonyms: rock candy |
| (noun) a lump or mass of hard consolidated mineral matter | Synonyms: stone |
| (noun) (figurative) someone who is strong and stable and dependable | - |
| (noun) material consisting of the aggregate of minerals like those making up the Earth's crust | Synonyms: stone |
| (verb) move back and forth or sideways | Synonyms: shake, sway |
| (verb) cause to move back and forth | Synonyms: sway |
| rockabilly | (noun) a fusion of black music and country music that was popular in the 1950s; sometimes described as blues with a country beat | - |
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| rockbound | (adjective) abounding in or bordered by rocky cliffs or scarps | Synonyms: rock-ribbed |
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| rockchuck | (noun) heavy-bodied yellowish-brown marmot of rocky areas of western North America | Synonyms: Marmota flaviventris, yellowbelly marmot |
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| rockcress | (noun) any of several rock-loving cresses of the genus Arabis | Synonyms: rock cress |
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| (noun) noxious cress with yellow flowers; sometimes placed in genus Sisymbrium | Synonyms: Barbarea vulgaris, rocket cress, Sisymbrium barbarea, yellow rocket |
| rocker | (noun) a curved support that permits the supported object to rock to and fro | - |
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| (noun) a chair mounted on rockers | Synonyms: rocking chair |
| (noun) an ice skate with a curved blade | - |
| (noun) a trough that can be rocked back and forth; used by gold miners to shake auriferous earth in water in order to separate the gold | Synonyms: cradle |
| (noun) a teenager or young adult in the 1960s who wore leather jackets and rode motorcycles | - |
| (noun) a performer or composer or fan of rock music | Synonyms: rock 'n' roll musician |
| (noun) an attendant who rocks a child in a cradle | - |
| rockers | (noun) originally a British youth subculture that evolved out of the teddy boys in the 1960s; wore black leather jackets and jeans and boots; had greased hair and rode motorcycles and listened to rock'n'roll; were largely unskilled manual laborers | Synonyms: bikers |
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| rockery | (noun) a garden featuring rocks; usually alpine plants | Synonyms: rock garden |
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| rocket | (noun) a jet engine containing its own propellant and driven by reaction propulsion | Synonyms: rocket engine |
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| (noun) any vehicle self-propelled by a rocket engine | Synonyms: projectile |
| (noun) sends a firework display high into the sky | Synonyms: skyrocket |
| (noun) propels bright light high in the sky, or used to propel a lifesaving line or harpoon | Synonyms: skyrocket |
| (noun) erect European annual often grown as a salad crop to be harvested when young and tender | Synonyms: arugula, Eruca sativa, Eruca vesicaria sativa, garden rocket, rocket salad, roquette |
| (verb) propel with a rocket | - |
| (verb) shoot up abruptly, like a rocket | Synonyms: skyrocket |
| rocketry | (noun) the branch of engineering science that studies rocket design and operation | - |
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| rockfish | (noun) marine food fish found among rocks along the northern coasts of Europe and America | - |
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| (noun) marine food and game fish with dark longitudinal stripes; migrates upriver to spawn; sometimes placed in the genus Morone | Synonyms: Roccus saxatilis, striped bass, striper |
| (noun) the lean flesh of any of various valuable market fish caught among rocks | - |
| rockfoil | (noun) any of various plants of the genus Saxifraga | Synonyms: breakstone, saxifrage |
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| rockiness | (noun) the quality of abounding in rocks and stones | - |
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| rocklike | (adjective) hard as granite | Synonyms: granitelike, granitic, stony |
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| rockrose | (noun) small shrubs of scrub and dry woodland regions of southern Europe and North Africa; grown for their showy flowers and soft often downy and aromatic evergreen foliage | Synonyms: rock rose |
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| (noun) any of numerous varieties of helianthemums having small rose-like yellow or white or reddish flowers | Synonyms: rock rose |
| rockslide | (noun) a landslide of rocks | - |
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| rockweed | (noun) coarse brown seaweed growing on rocks exposed at low tide | - |
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| rocky | (adjective) causing or characterized by jolts and irregular movements | Synonyms: bumpy, jolting, jolty, jumpy, rough |
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| (adjective) full of hardship or trials | Synonyms: rough |
| (adjective) abounding in rocks or stones | Synonyms: bouldered, bouldery, stony |
| (adjective) liable to rock | - |
| rococo | (adjective) having excessive asymmetrical ornamentation | - |
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| (noun) fanciful but graceful asymmetric ornamentation in art and architecture that originated in France in the 18th century | - |
| rod | (noun) any rod-shaped bacterium | - |
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| (noun) a long thin implement made of metal or wood | - |
| (noun) a gangster's pistol | Synonyms: gat |
| (noun) a visual receptor cell that is sensitive to dim light | Synonyms: retinal rod, rod cell |
| (noun) a linear measure of 16.5 feet | Synonyms: perch, pole |
| (noun) a square rod of land | Synonyms: perch, pole |
| rodent | (noun) relatively small placental mammals having a single pair of constantly growing incisor teeth specialized for gnawing | Synonyms: gnawer |
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| rodeo | (noun) an exhibition of cowboy skills | - |
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| (noun) an enclosure for cattle that have been rounded up | - |
| rodlike | (adjective) resembling a rod | Synonyms: rod-shaped |
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| rodomontade | (noun) vain and empty boasting | Synonyms: bluster, braggadocio, rhodomontade |
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| roe | (noun) eggs of female fish | - |
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| (noun) the eggs or egg-laden ovary of a fish | - |
| (noun) the egg mass or spawn of certain crustaceans such as the lobster | - |
| (noun) fish eggs or egg-filled ovary; having a grainy texture | Synonyms: hard roe |
| roebuck | (noun) male roe deer | - |
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| roentgen | (noun) a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air | Synonyms: R |
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| roentgenium | (noun) a radioactive transuranic element, with atomic number 111 | Synonyms: atomic number 111, element 111, Rg |
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| roentgenogram | (noun) a radiogram made by exposing photographic film to X rays; used in medical diagnosis | Synonyms: X-ray, X-ray photograph, X-ray picture, X ray |
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| roentgenographic | (adjective) relating to or produced by roentgenography | - |
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| roentgenography | (noun) radiography that uses X-rays to produce a roentgenogram | Synonyms: X-ray photography |
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| roentgenoscope | (noun) an X-ray machine that combines an X-ray source and a fluorescent screen to enable direct observation | Synonyms: fluoroscope |
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| rofecoxib | (noun) a Cox-2 inhibitor (trade name Vioxx) that relieves pain and inflammation without harming the digestive tract; voluntarily withdrawn from the market in 2004 | Synonyms: Vioxx |
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| rogation | (noun) a solemn supplication ceremony prescribed by the church | - |
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| rogue | (noun) a deceitful and unreliable scoundrel | Synonyms: knave, rapscallion, rascal, scalawag, scallywag, varlet |
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| roguery | (noun) reckless or malicious behavior that causes discomfort or annoyance in others | Synonyms: devilment, devilry, deviltry, mischief-making, mischief, mischievousness, rascality, roguishness, shenanigan |
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| roguish | (adjective) lacking principles or scruples | Synonyms: blackguardly, rascally, scoundrelly |
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| (adjective) playful in an appealingly bold way | Synonyms: devilish, rascally |
| roguishly | (adverb) in a playfully roguish manner | - |
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| (adverb) like a dishonest rogue | - |
| roguishness | (noun) reckless or malicious behavior that causes discomfort or annoyance in others | Synonyms: devilment, devilry, deviltry, mischief-making, mischief, mischievousness, rascality, roguery, shenanigan |
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| (noun) the trait of indulging in disreputable pranks | Synonyms: prankishness, rascality |
| roil | (verb) make turbid by stirring up the sediments of | Synonyms: rile |
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| (verb) be agitated | Synonyms: boil, churn, moil |
| roiled | (adjective) (of a liquid) agitated vigorously; in a state of turbulence | Synonyms: churning, roiling, roily, turbulent |
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| (adjective) aroused to impatience or anger | Synonyms: annoyed, irritated, miffed, nettled, peeved, pissed, pissed off, riled, steamed, stung |
| roiling | (adjective) (of a liquid) agitated vigorously; in a state of turbulence | Synonyms: churning, roiled, roily, turbulent |
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| roily | (adjective) (of a liquid) agitated vigorously; in a state of turbulence | Synonyms: churning, roiled, roiling, turbulent |
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| roister | (verb) engage in boisterous, drunken merrymaking | Synonyms: carouse, riot |
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| roisterer | (noun) an especially noisy and unrestrained merrymaker | - |
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| role | (noun) the actions and activities assigned to or required or expected of a person or group | Synonyms: function, office, part |
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| (noun) normal or customary activity of a person in a particular social setting | - |
| (noun) what something is used for | Synonyms: function, purpose, use |
| (noun) an actor's portrayal of someone in a play | Synonyms: character, part, persona, theatrical role |
| roleplay | (verb) perform on a stage or theater | Synonyms: act, play, playact |
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| roleplaying | (noun) acting a particular role (as in psychotherapy) | - |
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| roll | (noun) a flight maneuver; aircraft rotates about its longitudinal axis without changing direction or losing altitude | - |
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| (noun) the act of rolling something (as the ball in bowling) | Synonyms: bowl |
| (noun) the act of throwing dice | Synonyms: cast |
| (noun) walking with a swaying gait | - |
| (noun) anything rolled up in cylindrical form | - |
| (noun) photographic film rolled up inside a container to protect it from light | - |
| (noun) a list of names | Synonyms: roster |
| (noun) a document that can be rolled up (as for storage) | Synonyms: scroll |
| (noun) a deep prolonged sound (as of thunder or large bells) | Synonyms: peal, pealing, rolling |
| (noun) a long heavy sea wave as it advances towards the shore | Synonyms: roller, rolling wave |
| (noun) rotary motion of an object around its own axis | Synonyms: axial motion, axial rotation |
| (noun) the sound of a drum (especially a snare drum) beaten rapidly and continuously | Synonyms: drum roll, paradiddle |
| (noun) small rounded bread either plain or sweet | Synonyms: bun |
| (noun) a roll of currency notes (often taken as the resources of a person or business etc.) | Synonyms: bankroll |
| (noun) a round shape formed by a series of concentric circles (as formed by leaves or flower petals) | Synonyms: coil, curl, curlicue, gyre, ringlet, scroll, whorl |
| (verb) execute a roll, in tumbling | - |
| (verb) take the shape of a roll or cylinder | - |
| (verb) show certain properties when being rolled | Synonyms: roll up |
| (verb) boil vigorously | Synonyms: seethe |
| (verb) shape by rolling | - |
| (verb) pronounce with a roll, of the phoneme /r/ | - |
| (verb) arrange or coil around | Synonyms: twine, wind, wrap |
| (verb) begin operating or running | - |
| (verb) flatten or spread with a roller | Synonyms: roll out |
| (verb) move by turning over or rotating | Synonyms: turn over |
| (verb) move along on or as if on wheels or a wheeled vehicle | Synonyms: wheel |
| (verb) move about aimlessly or without any destination, often in search of food or employment | Synonyms: cast, drift, ramble, range, roam, rove, stray, swan, tramp, vagabond, wander |
| (verb) move in a wavy pattern or with a rising and falling motion | Synonyms: flap, undulate, wave |
| (verb) cause to move by turning over or in a circular manner of as if on an axis | Synonyms: revolve |
| (verb) move, rock, or sway from side to side | - |
| (verb) emit, produce, or utter with a deep prolonged reverberating sound | - |
| (verb) sell something to or obtain something from by energetic and especially underhanded activity | Synonyms: hustle, pluck |
| (verb) occur in soft rounded shapes | Synonyms: undulate |
| rollback | (noun) the act of forcing the enemy to withdraw | Synonyms: push back |
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| (noun) reducing prices back to some earlier level | - |
| rolled | (adjective) rolled up and secured | Synonyms: furled |
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| (adjective) especially of petals or leaves in bud; having margins rolled inward | Synonyms: involute |
| (adjective) uttered with a trill | Synonyms: rolling, trilled |
| roller | (noun) a grounder that rolls along the infield | - |
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| (noun) Old World bird that tumbles or rolls in flight; related to kingfishers | - |
| (noun) pigeon that executes backward somersaults in flight or on the ground | Synonyms: tumbler, tumbler pigeon |
| (noun) a cylinder that revolves | - |
| (noun) a mechanical device consisting of a cylindrical tube around which the hair is wound to curl it | Synonyms: crimper, curler, hair curler |
| (noun) a small wheel without spokes (as on a roller skate) | - |
| (noun) a long heavy sea wave as it advances towards the shore | Synonyms: roll, rolling wave |
| rollerblader | (noun) a skater who uses Rollerblades | - |
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