| redhead | (noun) black-and-white North American woodpecker having a red head and neck | Synonyms: Melanerpes erythrocephalus, redheaded woodpecker |
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| (noun) North American diving duck with a grey-and-black body and reddish-brown head | Synonyms: Aythya americana |
| (noun) someone who has red hair | Synonyms: carrottop, red-header, redheader |
| reduviid | (noun) a true bug: long-legged predacious bug living mostly on other insects; a few suck blood of mammals | Synonyms: assassin bug |
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| redwood | (noun) the soft reddish wood of either of two species of sequoia trees | - |
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| (noun) either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae | Synonyms: sequoia |
| (noun) wood of either of two huge coniferous California trees that reach a height of 300 feet; sometimes placed in the Taxodiaceae | Synonyms: sequoia |
| reed | (noun) a musical instrument that sounds by means of a vibrating reed | Synonyms: beating-reed instrument, reed instrument |
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| (noun) a vibrator consisting of a thin strip of stiff material that vibrates to produce a tone when air streams over it | Synonyms: vibrating reed |
| (noun) tall woody perennial grasses with hollow slender stems especially of the genera Arundo and Phragmites | - |
| reedbird | (noun) migratory American songbird | Synonyms: bobolink, Dolichonyx oryzivorus, ricebird |
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| (noun) small European warbler that breeds among reeds and wedges and winters in Africa | Synonyms: Acrocephalus schoenobaenus, sedge bird, sedge warbler, sedge wren |
| refund | (noun) the act of returning money received previously | Synonyms: repayment |
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| (noun) money returned to a payer | - |
| regard | (noun) a long fixed look | Synonyms: gaze |
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| (noun) (usually preceded by `in') a detail or point | Synonyms: respect |
| (noun) paying particular notice (as to children or helpless people) | Synonyms: attentiveness, heed, paying attention |
| (noun) an attitude of admiration or esteem | Synonyms: esteem, respect |
| (noun) (usually plural) a polite expression of desire for someone's welfare | Synonyms: compliments, wish |
| (noun) a feeling of friendship and esteem | Synonyms: respect |
| (noun) the condition of being honored (esteemed or respected or well regarded) | Synonyms: esteem, respect |
| remand | (noun) the act of sending an accused person back into custody to await trial (or the continuation of the trial) | - |
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| reprimand | (noun) an act or expression of criticism and censure | Synonyms: rebuke, reprehension, reproof, reproval |
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| resid | (noun) oil products that remain after petroleum has been distilled | Synonyms: residual oil |
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| resinoid | (noun) a plastic containing resins | - |
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| retard | (noun) a person of subnormal intelligence | Synonyms: changeling, cretin, half-wit, idiot, imbecile, moron |
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| retarded | (noun) people collectively who are mentally retarded | Synonyms: developmentally challenged, mentally retarded |
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| retread | (noun) a used automobile tire that has been remolded to give it new treads | Synonyms: recap |
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| retreated | (noun) people who have retreated | - |
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| reverend | (noun) a member of the clergy and a spiritual leader of the Christian Church | Synonyms: clergyman, man of the cloth |
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| reward | (noun) an act performed to strengthen approved behavior | Synonyms: reinforcement |
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| (noun) benefit resulting from some event or action | Synonyms: advantage |
| (noun) the offer of money for helping to find a criminal or for returning lost property | - |
| (noun) a recompense for worthy acts or retribution for wrongdoing | Synonyms: payoff, wages |
| (noun) payment made in return for a service rendered | - |
| rhizoid | (noun) any of various slender filaments that function as roots in mosses and ferns and fungi etc | - |
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| rhizopod | (noun) protozoa characterized by a pseudopod | Synonyms: rhizopodan |
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| rhomboid | (noun) any of several muscles of the upper back that help move the shoulder blade | Synonyms: rhomboid muscle |
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| (noun) a parallelogram with adjacent sides of unequal lengths; an oblique-angled parallelogram with only the opposite sides equal | - |
| ribald | (noun) a ribald person; someone who uses vulgar and offensive language | - |
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| riband | (noun) a ribbon used as a decoration | Synonyms: ribband |
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| ribband | (noun) a ribbon used as a decoration | Synonyms: riband |
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| ribbonwood | (noun) small tree or shrub of New Zealand having a profusion of axillary clusters of honey-scented paper-white flowers and whose bark is used for cordage | Synonyms: Hoheria populnea, houhere, lacebark |
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| (noun) deciduous New Zealand tree whose inner bark yields a strong fiber that resembles flax and is called New Zealand cotton | Synonyms: Plagianthus betulinus, Plagianthus regius, ribbon tree |
| ricebird | (noun) migratory American songbird | Synonyms: bobolink, Dolichonyx oryzivorus, reedbird |
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| (noun) small finch-like Indonesian weaverbird that frequents rice fields | Synonyms: Java finch, Java sparrow, Padda oryzivora |
| richweed | (noun) a plants of the genus Pilea having drooping green flower clusters and smooth translucent stems and leaves | Synonyms: clearweed, dead nettle, Pilea pumilla |
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| (noun) erect perennial strong-scented with serrate pointed leaves and a loose panicle of yellowish flowers; the eastern United States | Synonyms: Collinsonia canadensis, horse balm, horseweed, stone-root, stone root, stoneroot |
| riflebird | (noun) velvety black Australian bird of paradise with green and purple iridescence on head and tail | Synonyms: Ptloris paradisea |
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| rightfield | (noun) the fielding position of the player on a baseball team who is expected to field balls in the right third of the outfield (looking from home plate) | Synonyms: right field |
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| (noun) the piece of ground in the outfield on the catcher's right | Synonyms: right, right field |
| rind | (noun) the natural outer covering of food (usually removed before eating) | - |
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| ripcord | (noun) a cord that is pulled to open a parachute from its pack during a descent | - |
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| (noun) a cord that is pulled to open the gasbag of a balloon wide enough to release gas and so causes the balloon to descend | - |
| riverbed | (noun) a channel occupied (or formerly occupied) by a river | Synonyms: river bottom |
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| 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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| roadstead | (noun) a partly sheltered anchorage | Synonyms: roads |
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| rockweed | (noun) coarse brown seaweed growing on rocks exposed at low tide | - |
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| 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 |
| rood | (noun) representation of the cross on which Jesus died | Synonyms: crucifix, rood-tree |
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| rosebud | (noun) (a literary reference to) a pretty young girl | - |
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| (noun) the bud of a rose | - |
| rosewood | (noun) any of those hardwood trees of the genus Dalbergia that yield rosewood--valuable cabinet woods of a dark red or purplish color streaked and variegated with black | Synonyms: rosewood tree |
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| (noun) hard dark reddish wood of a rosewood tree having a strongly marked grain; used in cabinetwork | - |
| rosinweed | (noun) North American perennial having a resinous odor and yellow flowers | Synonyms: Silphium laciniatum |
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| (noun) any of various western American plants of the genus Grindelia having resinous leaves and stems formerly used medicinally; often poisonous to livestock | Synonyms: gum plant, gumweed, tarweed |
| round | (noun) (often plural) a series of professional calls (usually in a set order) | - |
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| (noun) the usual activities in your day | Synonyms: daily round |
| (noun) the activity of playing 18 holes of golf | Synonyms: round of golf |
| (noun) any circular or rotating mechanism | Synonyms: circle |
| (noun) a charge of ammunition for a single shot | Synonyms: one shot, unit of ammunition |
| (noun) a crosspiece between the legs of a chair | Synonyms: rung, stave |
| (noun) a partsong in which voices follow each other; one voice starts and others join in one after another until all are singing different parts of the song at the same time | Synonyms: troll |
| (noun) an outburst of applause | - |
| (noun) a cut of beef between the rump and the lower leg | - |
| (noun) a serving to each of a group (usually alcoholic) | Synonyms: round of drinks |
| (noun) a regular route for a sentry or policeman | Synonyms: beat |
| (noun) the course along which communications spread | - |
| (noun) (sports) a division of a game during which one team is on the offensive | Synonyms: bout, turn |
| (noun) an interval during which a recurring sequence of events occurs | Synonyms: cycle, rhythm |
| roundhead | (noun) a brachycephalic person | - |
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| rudd | (noun) European freshwater fish resembling the roach | Synonyms: Scardinius erythrophthalmus |
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| rutherford | (noun) a unit strength of a radioactive source equal to one million disintegrations per second | - |
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| safeguard | (noun) a precautionary measure warding off impending danger or damage or injury etc. | Synonyms: guard, precaution |
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| (noun) a document or escort providing safe passage through a region especially in time of war | Synonyms: safe-conduct |
| safehold | (noun) a refuge from attack | - |
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| sainthood | (noun) the status and dignity of a saint | - |
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| (noun) saints collectively | - |
| salad | (noun) food mixtures either arranged on a plate or tossed and served with a moist dressing; usually consisting of or including greens | - |
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| salmonid | (noun) soft-finned fishes of cold and temperate waters | - |
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| salmwood | (noun) large tropical American tree of the genus Cordia grown for its abundant creamy white flowers and valuable wood | Synonyms: Cordia alliodora, cypre, Equador laurel, princewood, Spanish elm |
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| sand | (noun) fortitude and determination | Synonyms: backbone, grit, gumption, guts, moxie |
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| (noun) a loose material consisting of grains of rock or coral | - |
| sandalwood | (noun) close-grained fragrant yellowish heartwood of the true sandalwood; has insect repelling properties and is used for carving and cabinetwork | - |
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| saphead | (noun) a person who lacks good judgment | Synonyms: fool, muggins, sap, tomfool |
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| sapwood | (noun) newly formed outer wood lying between the cambium and the heartwood of a tree or woody plant; usually light colored; active in water conduction | - |
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| saraband | (noun) a stately court dance of the 17th and 18th centuries; in slow time | - |
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| (noun) music composed for dancing the saraband | - |
| sarcoptid | (noun) whitish mites that attack the skin of humans and other animals | Synonyms: itch mite |
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| sard | (noun) a deep orange-red variety of chalcedony | Synonyms: sardine, sardius |
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| satinpod | (noun) southeastern European plant cultivated for its fragrant purplish flowers and round flat papery silver-white seedpods that are used for indoor decoration | Synonyms: honesty, Lunaria annua, money plant, satin flower, silver dollar |
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| satinwood | (noun) East Indian tree with valuable hard lustrous yellowish wood | Synonyms: Chloroxylon swietenia, satinwood tree |
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| (noun) West Indian tree with smooth lustrous and slightly oily wood | Synonyms: West Indian satinwood, Zanthoxylum flavum |
| (noun) hard yellowish wood of a satinwood tree having a satiny luster; used for fine cabinetwork and tools | - |
| saturniid | (noun) large brightly colored and usually tropical moth; larvae spin silken cocoons | Synonyms: saturniid moth |
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| sauropod | (noun) very large herbivorous dinosaur of the Jurassic and Cretaceous having a small head on a long neck and tail and five-toed limbs; largest known land animal | Synonyms: sauropod dinosaur |
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| scabbard | (noun) a sheath for a sword or dagger or bayonet | - |
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| scad | (noun) any of a number of fishes of the family Carangidae | - |
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| scaffold | (noun) a temporary arrangement erected around a building for convenience of workers | - |
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| (noun) a platform from which criminals are executed (hanged or beheaded) | - |
| scald | (noun) the act of burning with steam or hot water | - |
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| (noun) a burn cause by hot liquid or steam | - |
| scaphopod | (noun) burrowing marine mollusk | - |
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| scarabaeid | (noun) any of numerous species of stout-bodied beetles having heads with horny spikes | Synonyms: scarabaean, scarabaeid beetle |
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| scattergood | (noun) someone who spends money prodigally | Synonyms: spend-all, spender, spendthrift |
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| schizoid | (noun) characterized by symptoms similar to but less severe than schizophrenia | Synonyms: schizotypal personality |
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| schoolchild | (noun) a young person attending school (up through senior high school) | Synonyms: pupil, school-age child |
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| schoolfriend | (noun) a friend who attends the same school | - |
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| schoolyard | (noun) the yard associated with a school | - |
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| schrod | (noun) young Atlantic cod or haddock especially one split and boned for cooking | Synonyms: scrod |
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| (noun) flesh of young Atlantic cod weighing up to 2 pounds; also young haddock and pollock; often broiled | Synonyms: scrod |
| sciaenid | (noun) widely distributed family of carnivorous percoid fishes having a large air bladder used to produce sound | Synonyms: sciaenid fish |
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| sciarid | (noun) minute blackish gregarious flies destructive to mushrooms and seedlings | Synonyms: fungus gnat, sciara |
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| scincid | (noun) alert agile lizard with reduced limbs and an elongated body covered with shiny scales; more dependent on moisture than most lizards; found in tropical regions worldwide | Synonyms: scincid lizard, skink |
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| scold | (noun) someone (especially a woman) who annoys people by constantly finding fault | Synonyms: common scold, nag, nagger, scolder |
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| scombroid | (noun) important marine food and game fishes found in all tropical and temperate seas; some are at least partially endothermic and can thrive in colder waters | Synonyms: scombroid fish |
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| scoreboard | (noun) a large board for displaying the score of a contest (and some other information) | - |
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| scorecard | (noun) (golf) a record of scores (as in golf) | Synonyms: card |
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| scorpaenid | (noun) any of numerous carnivorous usually bottom-dwelling warm-water marine fishes found worldwide but most abundant in the Pacific | Synonyms: scorpaenid fish |
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| scorpaenoid | (noun) fishes having the head armored with bony plates | Synonyms: scorpaenoid fish |
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| scorpionweed | (noun) any plant of the genus Phacelia | Synonyms: phacelia, scorpion weed |
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| scratchpad | (noun) (computer science) a high-speed internal memory used for temporary storage of preliminary information | - |
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| screed | (noun) an accurately levelled strip of material placed on a wall or floor as guide for the even application of plaster or concrete | - |
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| (noun) a long piece of writing | - |
| (noun) a long monotonous harangue | - |
| screenland | (noun) the personnel of the film industry | Synonyms: filmdom, screen |
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| scrod | (noun) young Atlantic cod or haddock especially one split and boned for cooking | Synonyms: schrod |
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| (noun) flesh of young Atlantic cod weighing up to 2 pounds; also young haddock and pollock; often broiled | Synonyms: schrod |
| scrubbird | (noun) small fast-running Australian bird resembling a wren and frequenting brush or scrub | Synonyms: scrub-bird, scrub bird |
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| scrubland | (noun) an uncultivated region covered with scrub vegetation | - |
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| scud | (noun) the act of moving along swiftly (as before a gale) | Synonyms: scudding |
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| seabed | (noun) the bottom of a sea or ocean | Synonyms: Davy Jones's locker, Davy Jones, ocean bottom, ocean floor, sea bottom, sea floor |
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| seabird | (noun) a bird that frequents coastal waters and the open ocean: gulls, pelicans, gannets, cormorants, albatrosses, petrels, etc. | Synonyms: sea bird, seafowl |
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| seaboard | (noun) the shore of a sea or ocean regarded as a resort | Synonyms: seaside |
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| seafood | (noun) edible fish (broadly including freshwater fish) or shellfish or roe etc | - |
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| seaward | (noun) the direction toward the sea | - |
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| seaweed | (noun) plant growing in the sea, especially marine algae | - |
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| second | (noun) the fielding position of the player on a baseball team who is stationed near the second of the bases in the infield | Synonyms: second base |
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| (noun) the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle | Synonyms: second gear |
| (noun) merchandise that has imperfections; usually sold at a reduced price without the brand name | Synonyms: irregular |
| (noun) a speech seconding a motion | Synonyms: endorsement, indorsement, secondment |
| (noun) the official attendant of a contestant in a duel or boxing match | - |
| (noun) a 60th part of a minute of arc | Synonyms: arcsecond |
| (noun) following the first in an ordering or series | - |
| (noun) 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites | Synonyms: s, sec |
| (noun) an indefinitely short time | Synonyms: bit, minute, mo, moment |
| (noun) a particular point in time | Synonyms: instant, minute, moment |
| seed | (noun) the thick white fluid containing spermatozoa that is ejaculated by the male genital tract | Synonyms: come, cum, ejaculate, semen, seminal fluid |
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| (noun) anything that provides inspiration for later work | Synonyms: germ, source |
| (noun) one of the outstanding players in a tournament | Synonyms: seeded player |
| (noun) a small hard fruit | - |
| (noun) a mature fertilized plant ovule consisting of an embryo and its food source and having a protective coat or testa | - |
| seedbed | (noun) a bed where seedlings are grown before transplanting | - |
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| seedpod | (noun) a several-seeded dehiscent fruit as e.g. of a leguminous plant | Synonyms: pod |
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