| repeater | (noun) a firearm that can fire several rounds without reloading | Synonyms: repeating firearm |
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| (noun) (electronics) electronic device that amplifies a signal before transmitting it again | - |
| (noun) a person who repeats | - |
| (noun) someone who is repeatedly arrested for criminal behavior (especially for the same criminal behavior) | Synonyms: habitual criminal, recidivist |
| reporter | (noun) a person who investigates and reports or edits news stories | Synonyms: newsperson |
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| requester | (noun) one praying humbly for something | Synonyms: petitioner, suppliant, supplicant |
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| resister | (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructionist, obstructor, thwarter |
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| (noun) someone who offers opposition | Synonyms: adversary, antagonist, opponent, opposer |
| respecter | (noun) a person who respects someone or something; usually used in the negative | - |
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| restauranter | (noun) the proprietor of a restaurant | Synonyms: restaurateur |
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| rester | (noun) a person who rests | - |
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| rewriter | (noun) someone who puts text into appropriate form for publication | Synonyms: redact, redactor, reviser, rewrite man |
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| rheometer | (noun) an instrument for measuring the flow of liquids (especially arterial blood) | - |
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| rhymester | (noun) a writer who composes rhymes; a maker of poor verses (usually used as terms of contempt for minor or inferior poets) | Synonyms: poetiser, poetizer, rhymer, versifier |
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| ringmaster | (noun) the person in charge of performances in a circus ring | - |
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| rioter | (noun) troublemaker who participates in a violent disturbance of the peace; someone who rises up against the constituted authority | - |
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| riveter | (noun) a machine for driving rivets | Synonyms: riveting machine, rivetter |
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| (noun) a worker who inserts and hammers rivets | Synonyms: rivetter |
| rivetter | (noun) a machine for driving rivets | Synonyms: riveter, riveting machine |
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| (noun) a worker who inserts and hammers rivets | Synonyms: riveter |
| 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 |
| 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) | - |
| rooster | (noun) adult male chicken | Synonyms: cock |
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| rooter | (noun) an enthusiastic devotee of sports | Synonyms: fan, sports fan |
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| roster | (noun) a list of names | Synonyms: roll |
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| rotter | (noun) a person who is deemed to be despicable or contemptible | Synonyms: bum, crumb, dirty dog, git, lowlife, puke, rat, scum bag, scumbag, skunk, so-and-so, stinker, stinkpot |
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| router | (noun) (computer science) a device that forwards data packets between computer networks | - |
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| (noun) a worker who routes shipments for distribution and delivery | - |
| (noun) a power tool with a shaped cutter; used in carpentry for cutting grooves | - |
| salinometer | (noun) a hydrometer that determines the concentration of salt solutions by measuring their density | - |
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| salter | (noun) someone who makes or deals in salt | Synonyms: salt merchant |
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| (noun) someone who uses salt to preserve meat or fish or other foods | - |
| saltpeter | (noun) (KNO3) used especially as a fertilizer and explosive | Synonyms: niter, nitre, potassium nitrate, saltpetre |
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| saltwater | (noun) water containing salts | Synonyms: brine, seawater |
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| saluter | (noun) a person who greets | Synonyms: greeter, welcomer |
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| sandblaster | (noun) a tool that throws out a blast of steam laden with sand; used to clean or grind hard surfaces | - |
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| saunter | (noun) a leisurely walk (usually in some public place) | Synonyms: amble, perambulation, promenade, stroll |
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| (noun) a careless leisurely gait | - |
| scatter | (noun) the act of scattering | Synonyms: scattering, strewing |
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| (noun) a haphazard distribution in all directions | Synonyms: spread |
| sceneshifter | (noun) a stagehand responsible for moving scenery | Synonyms: shifter |
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| scepter | (noun) a ceremonial or emblematic staff | Synonyms: sceptre, verge, wand |
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| (noun) the imperial authority symbolized by a scepter | Synonyms: sceptre |
| schlockmeister | (noun) (slang) a merchant who deals in shoddy or inferior merchandise | Synonyms: shlockmeister |
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| schoolmaster | (noun) food fish of warm Caribbean and Atlantic waters | Synonyms: Lutjanus apodus |
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| (noun) presiding officer of a school | Synonyms: headmaster, master |
| (noun) any person (or institution) who acts as an educator | - |
| sclerometer | (noun) a measuring instrument that measures the hardness of materials by penetrating them with a stylus that has a diamond point | - |
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| scooter | (noun) large black diving duck of northern parts of the Northern Hemisphere | Synonyms: scoter |
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| (noun) child's two-wheeled vehicle operated by foot | - |
| (noun) a wheeled vehicle with small wheels and a low-powered gasoline engine geared to the rear wheel | Synonyms: motor scooter |
| (noun) a sailing vessel with runners and a cross-shaped frame; suitable for traveling over ice | Synonyms: ice yacht, iceboat |
| (noun) a motorboat resembling a motor scooter | Synonyms: sea scooter, water scooter |
| scoter | (noun) large black diving duck of northern parts of the Northern Hemisphere | Synonyms: scooter |
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| scouter | (noun) an adult member of the Boy Scouts movement | Synonyms: rover |
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| scoutmaster | (noun) the leader of a troop of Scouts | - |
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| screenwriter | (noun) someone who writes screenplays | Synonyms: film writer |
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| scriptwriter | (noun) someone who writes scripts for plays or movies or broadcast dramas | - |
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| seamster | (noun) a person whose occupation is making and altering garments | Synonyms: sartor, tailor |
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| seawater | (noun) water containing salts | Synonyms: brine, saltwater |
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| secreter | (noun) any of various organs that synthesize substances needed by the body and release it through ducts or directly into the bloodstream | Synonyms: gland, secretor, secretory organ |
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| semester | (noun) one of two divisions of an academic year | - |
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| (noun) half a year; a period of 6 months | - |
| semidiameter | (noun) the apparent radius of a celestial body when viewed as a disc from the earth | - |
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| sensitometer | (noun) a measuring instrument for measuring the light sensitivity of film over a range of exposures | - |
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| setter | (noun) a long-haired dog formerly trained to crouch on finding game but now to point | - |
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| (noun) one who sets written material into type | Synonyms: compositor, typesetter, typographer |
| sharpshooter | (noun) a fast schooner once used by New England fisherman for illegal fishing in Canadian waters | - |
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| (noun) someone skilled in shooting | Synonyms: crack shot, marksman |
| (noun) an athlete noted for accurate aim | - |
| shearwater | (noun) long-winged oceanic bird that in flight skims close to the waves | - |
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| shelter | (noun) a structure that provides privacy and protection from danger | - |
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| (noun) protective covering that provides protection from the weather | - |
| (noun) temporary housing for homeless or displaced persons | - |
| (noun) a way of organizing business to reduce the taxes it must pay on current earnings | Synonyms: tax shelter |
| (noun) the condition of being protected | Synonyms: protection |
| shifter | (noun) a mechanical device for engaging and disengaging gears | Synonyms: gear lever, gearshift, gearstick |
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| (noun) a stagehand responsible for moving scenery | Synonyms: sceneshifter |
| shinplaster | (noun) paper money of little value issued on insufficient security | - |
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| shirtlifter | (noun) a homosexual man | Synonyms: gay man |
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| shirtwaister | (noun) a blouse with buttons down the front | Synonyms: shirtwaist |
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| shitter | (noun) a person who defecates | Synonyms: defecator, voider |
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| shlockmeister | (noun) (slang) a merchant who deals in shoddy or inferior merchandise | Synonyms: schlockmeister |
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| shooter | (noun) a large marble used for shooting in the game of marbles | Synonyms: taw |
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| (noun) a person who shoots (usually with respect to their ability to shoot) | Synonyms: shot |
| (noun) a professional killer who uses a gun | Synonyms: gun, gun for hire, gunman, gunslinger, hired gun, hit man, hitman, torpedo, triggerman |
| (noun) (sports) a player who drives or kicks a ball at the goal (or a basketball player who shoots at the basket) | - |
| (noun) a gambler who throws dice in the game of craps | Synonyms: crap-shooter |
| shoplifter | (noun) a thief who steals goods that are in a store | Synonyms: booster, lifter |
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| shouter | (noun) someone who communicates vocally in a very loud voice | Synonyms: bawler, bellower, roarer, screamer, screecher, yeller |
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| shunter | (noun) a small locomotive used to move cars around but not to make trips | - |
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| shutter | (noun) a hinged blind for a window | - |
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| (noun) a mechanical device on a camera that opens and closes to control the time of a photographic exposure | - |
| shyster | (noun) a person (especially a lawyer or politician) who uses unscrupulous or unethical methods | Synonyms: pettifogger |
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| sidesplitter | (noun) a joke that seems extremely funny | Synonyms: belly laugh, howler, riot, scream, thigh-slapper, wow |
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| sifter | (noun) a household sieve (as for flour) | - |
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| sister | (noun) a female person who has the same parents as another person | Synonyms: sis |
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| (noun) a female person who is a fellow member of a sorority or labor union or other group | - |
| sitter | (noun) a domestic hen ready to brood | Synonyms: brood hen, broody, broody hen, setting hen |
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| (noun) a person engaged to care for children when the parents are not home | Synonyms: baby-sitter, babysitter |
| (noun) an organism (person or animal) that sits | - |
| (noun) a person who poses for a painter or sculptor | Synonyms: artist's model |
| skater | (noun) someone who skates | - |
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| slater | (noun) any of various small terrestrial isopods having a flat elliptical segmented body; found in damp habitats | Synonyms: wood louse, woodlouse |
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| slaughter | (noun) the killing of animals (as for food) | - |
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| (noun) the savage and excessive killing of many people | Synonyms: butchery, carnage, mass murder, massacre |
| (noun) a sound defeat | Synonyms: debacle, drubbing, thrashing, trouncing, walloping, whipping |
| smelter | (noun) an industrial plant for smelting | Synonyms: smeltery |
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| snifter | (noun) a globular glass with a small top; used for serving brandy | Synonyms: brandy glass, brandy snifter |
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| snorter | (noun) something that is extraordinary or remarkable or prominent | - |
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| (noun) something outstandingly difficult | - |
| (noun) someone who expresses contempt or indignation by uttering a snorting sound | - |
| sodbuster | (noun) a person who operates a farm | Synonyms: farmer, granger, husbandman |
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| solenogaster | (noun) deep-water wormlike mollusks lacking calcareous plates on the body but having fine slimy spicules on the covering mantle | Synonyms: aplacophoran |
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| songster | (noun) any bird having a musical call | Synonyms: songbird |
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| (noun) a person who sings with skill | - |
| (noun) a composer of words or music for popular songs | Synonyms: ballad maker, songwriter |
| songwriter | (noun) a composer of words or music for popular songs | Synonyms: ballad maker, songster |
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| sonometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: audiometer |
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| sorter | (noun) a machine for sorting things (such as punched cards or letters) into classes | - |
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| (noun) a clerk who sorts things (as letters at the post office) | - |
| southeaster | (noun) a strong wind from the southeast | Synonyms: sou'easter |
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| southwester | (noun) a strong wind from the southwest | Synonyms: sou'wester |
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| spatter | (noun) the act of splashing a (liquid) substance on a surface | Synonyms: spattering, splash, splashing, splattering |
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| (noun) the noise of something spattering or sputtering explosively | Synonyms: spattering, splatter, splattering, splutter, sputter, sputtering |
| specter | (noun) a mental representation of some haunting experience | Synonyms: ghost, shade, spectre, spook, wraith |
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| (noun) a ghostly appearing figure | Synonyms: apparition, fantasm, phantasm, phantasma, phantom, spectre |
| spectrometer | (noun) spectroscope for obtaining a mass spectrum by deflecting ions into a thin slit and measuring the ion current with an electrometer | Synonyms: mass spectrometer |
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| spectrophotometer | (noun) a photometer for comparing two light radiations wavelength by wavelength | - |
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| speechwriter | (noun) a writer who composes speeches for others to deliver | - |
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| speedometer | (noun) a meter fixed to a vehicle that measures and displays its speed | Synonyms: speed indicator |
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| speedskater | (noun) an ice-skater who races competitively; usually around an oval course | Synonyms: speed skater |
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| spelter | (noun) impure zinc containing about three percent lead and other impurities (especially in the form of ingots) | - |
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| spherometer | (noun) a measuring instrument for measuring the curvature of a surface | - |
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| sphincter | (noun) a ring of muscle that contracts to close an opening | Synonyms: anatomical sphincter, sphincter muscle |
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| sphygmomanometer | (noun) a pressure gauge for measuring blood pressure | - |
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| spinmeister | (noun) a public relations person who tries to forestall negative publicity by publicizing a favorable interpretation of the words or actions of a company or political party or famous person | Synonyms: spin doctor |
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| spinster | (noun) an elderly unmarried woman | Synonyms: old maid |
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| (noun) someone who spins (who twists fibers into threads) | Synonyms: spinner, thread maker |
| spirometer | (noun) a measuring instrument for measuring the vital capacity of the lungs | - |
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| spitter | (noun) an illegal pitch in which a foreign substance (spit or Vaseline) is applied to the ball by the pitcher before he throws it | Synonyms: spitball |
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| (noun) a person who spits (ejects saliva or phlegm from the mouth) | Synonyms: expectorator |
| splatter | (noun) the noise of something spattering or sputtering explosively | Synonyms: spatter, spattering, splattering, splutter, sputter, sputtering |
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| (noun) a small quantity of something moist or liquid | Synonyms: dab, splash |
| splinter | (noun) a small thin sharp bit of wood or glass or metal | Synonyms: sliver |
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| splitter | (noun) a taxonomist who classifies organisms into many groups on the basis of relatively minor characteristics | Synonyms: divider |
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| (noun) a worker who splits fish and removes the backbone | - |
| (noun) a laborer who splits logs to build split-rail fences | Synonyms: rail-splitter |
| splutter | (noun) an utterance (of words) with spitting sounds (as in rage) | Synonyms: sputter |
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| (noun) the noise of something spattering or sputtering explosively | Synonyms: spatter, spattering, splatter, splattering, sputter, sputtering |
| sportscaster | (noun) an announcer who reads sports news or describes sporting events | Synonyms: sports announcer, sports commentator |
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