| affirmer | (noun) someone who claims to speak the truth | Synonyms: asserter, asseverator, avower, declarer |
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| astronomer | (noun) a physicist who studies astronomy | Synonyms: stargazer, uranologist |
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| backswimmer | (noun) predaceous aquatic insect that swims on its back and may inflict painful bites | Synonyms: Notonecta undulata |
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| barnstormer | (noun) a pilot who travels around the country giving exhibits of stunt flying and parachuting | Synonyms: stunt flier, stunt pilot |
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| (noun) an actor who travels around the country presenting plays | Synonyms: play-actor, playactor, trouper |
| blasphemer | (noun) a person who speaks disrespectfully of sacred things | - |
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| bloomer | (noun) an embarrassing mistake | Synonyms: blooper, blunder, boner, boo-boo, botch, bungle, flub, foul-up, fuckup, pratfall |
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| (noun) a flower that blooms in a particular way | - |
| boomer | (noun) a member of the baby boom generation in the 1950s | Synonyms: baby boomer |
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| bummer | (noun) an experience that is irritating or frustrating or disappointing | - |
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| (noun) a bad reaction to a hallucinogenic drug | - |
| charmer | (noun) a person who charms others (usually by personal attractiveness) | Synonyms: beguiler |
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| (noun) someone with an assured and ingratiating manner | Synonyms: smoothie, smoothy, sweet talker |
| chimer | (noun) a fur-lined coat decorated with braid, worn in the sixteenth century. | Synonyms: chamarre, simarre |
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| clawhammer | (noun) a hammer with a cleft at one end for pulling nails | Synonyms: carpenter's hammer, claw hammer |
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| comer | (noun) someone who arrives (or has arrived) | Synonyms: arrival, arriver |
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| (noun) someone with a promising future | - |
| consumer | (noun) a person who uses goods or services | - |
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| copolymer | (noun) a polymer consisting of two or more different monomers | - |
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| costumer | (noun) someone who designs or supplies costumes (as for a play or masquerade) | Synonyms: costume designer, costumier |
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| crammer | (noun) a textbook designed for cramming | - |
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| (noun) a special school where students are crammed | - |
| (noun) a student who crams | - |
| (noun) a teacher who is paid to cram students for examinations | - |
| creamer | (noun) a small pitcher for serving cream | Synonyms: cream pitcher |
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| customer | (noun) someone who pays for goods or services | Synonyms: client |
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| daydreamer | (noun) someone who indulges in idle or absentminded daydreaming | Synonyms: woolgatherer |
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| defamer | (noun) one who attacks the reputation of another by slander or libel | Synonyms: backbiter, libeler, maligner, slanderer, traducer, vilifier |
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| dimer | (noun) a compound whose molecules are composed of two identical monomers | - |
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| dimmer | (noun) a rheostat that varies the current through an electric light in order to control the level of illumination | - |
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| disarmer | (noun) someone opposed to violence as a means of settling disputes | Synonyms: pacificist, pacifist |
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| disclaimer | (noun) (law) a voluntary repudiation of a person's legal claim to something | - |
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| (noun) denial of any connection with or knowledge of | Synonyms: disavowal |
| dormer | (noun) a gabled extension built out from a sloping roof to accommodate a vertical window | Synonyms: dormer window |
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| dreamer | (noun) a person who escapes into a world of fantasy | Synonyms: escapist, wishful thinker |
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| (noun) someone guided more by ideals than by practical considerations | Synonyms: idealist |
| (noun) someone who is dreaming | - |
| drummer | (noun) someone who plays a drum | - |
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| dulcimer | (noun) a trapezoidal zither whose metal strings are struck with light hammers | - |
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| (noun) a stringed instrument used in American folk music; an elliptical body and a fretted fingerboard and three strings | - |
| elastomer | (noun) any of various elastic materials that resemble rubber (resumes its original shape when a deforming force is removed) | - |
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| embalmer | (noun) a mortician who treats corpses with preservatives | - |
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| emmer | (noun) hard red wheat grown especially in Russia and Germany; in United States as stock feed | Synonyms: starch wheat, Triticum dicoccum, two-grain spelt |
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| enantiomer | (noun) either one of a pair of compounds (crystals or molecules) that are mirror images on each other but are not identical | Synonyms: enantiomorph |
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| farmer | (noun) a person who operates a farm | Synonyms: granger, husbandman, sodbuster |
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| former | (noun) the first of two or the first mentioned of two | - |
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| framer | (noun) someone who writes a new law or plan | - |
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| (noun) someone who makes frames (as for pictures) | - |
| glimmer | (noun) a slight suggestion or vague understanding | Synonyms: glimmering, inkling, intimation |
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| (noun) a flash of light (especially reflected light) | Synonyms: gleam, gleaming |
| gossamer | (noun) a gauze fabric with an extremely fine texture | - |
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| (noun) filaments from a web that was spun by a spider | Synonyms: cobweb |
| hammer | (noun) the act of pounding (delivering repeated heavy blows) | Synonyms: hammering, pound, pounding |
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| (noun) a hand tool with a heavy rigid head and a handle; used to deliver an impulsive force by striking | - |
| (noun) a power tool for drilling rocks | Synonyms: power hammer |
| (noun) a striker that is covered in felt and that causes the piano strings to vibrate | - |
| (noun) a light drumstick with a rounded head that is used to strike such percussion instruments as chimes, kettledrums, marimbas, glockenspiels, etc. | Synonyms: mallet |
| (noun) the part of a gunlock that strikes the percussion cap when the trigger is pulled | Synonyms: cock |
| (noun) a heavy metal sphere attached to a flexible wire; used in the hammer throw | - |
| (noun) the ossicle attached to the eardrum | Synonyms: malleus |
| homer | (noun) a base hit on which the batter scores a run | Synonyms: home run |
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| (noun) pigeon trained to return home | Synonyms: homing pigeon |
| (noun) an ancient Hebrew unit of capacity equal to 10 baths or 10 ephahs | Synonyms: kor |
| hummer | (noun) (baseball) a pitch thrown with maximum velocity | Synonyms: bullet, fastball, heater, smoke |
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| (noun) a singer who produces a tune without opening the lips or forming words | - |
| informer | (noun) one who reveals confidential information to the police or other authority | Synonyms: betrayer, blabber, rat, squealer |
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| isomer | (noun) a compound that exists in forms having different arrangements of atoms but the same molecular weight | - |
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| jackhammer | (noun) a hammer driven by compressed air | Synonyms: air hammer, pneumatic hammer |
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| jammer | (noun) a transmitter used to broadcast electronic jamming | - |
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| katzenjammer | (noun) loud confused noise from many sources | Synonyms: brouhaha, hubbub, uproar |
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| (noun) disagreeable aftereffects from the use of drugs (especially alcohol) | Synonyms: hangover |
| latecomer | (noun) someone who arrives late | - |
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| maimer | (noun) a person who mutilates or destroys or disfigures or cripples | Synonyms: mangler, mutilator |
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| midsummer | (noun) June 21, when the sun is at its northernmost point | Synonyms: June 21, summer solstice |
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| mimer | (noun) an actor who communicates entirely by gesture and facial expression | Synonyms: mime, mummer, pantomimer, pantomimist |
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| misnomer | (noun) an incorrect or unsuitable name | - |
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| monomer | (noun) a simple compound whose molecules can join together to form polymers | - |
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| mummer | (noun) an actor who communicates entirely by gesture and facial expression | Synonyms: mime, mimer, pantomimer, pantomimist |
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| namer | (noun) a person who gives a name or names | - |
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| newcomer | (noun) any new participant in some activity | Synonyms: entrant, fledgeling, fledgling, freshman, neophyte, newbie, starter |
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| (noun) a recent arrival | - |
| oldtimer | (noun) an elderly man | Synonyms: antique, gaffer, old-timer, old geezer |
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| (noun) an experienced person who has been through many battles; someone who has given long service | Synonyms: old-timer, old hand, old stager, stager, veteran, warhorse |
| ormer | (noun) an abalone found near the Channel Islands | Synonyms: Haliotis tuberculata, sea-ear |
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| overcomer | (noun) someone who overcomes and establishes ascendancy and control by force or persuasion | Synonyms: subduer, surmounter |
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| pantomimer | (noun) an actor who communicates entirely by gesture and facial expression | Synonyms: mime, mimer, mummer, pantomimist |
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| performer | (noun) an entertainer who performs a dramatic or musical work for an audience | Synonyms: performing artist |
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| perfumer | (noun) a person who makes (and sells) perfumes | - |
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| polymer | (noun) a naturally occurring or synthetic compound consisting of large molecules made up of a linked series of repeated simple monomers | - |
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| primer | (noun) any igniter that is used to initiate the burning of a propellant | Synonyms: fuse, fusee, fuze, fuzee, priming |
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| (noun) the first or preliminary coat of paint or size applied to a surface | Synonyms: flat coat, ground, primer coat, priming, priming coat, undercoat |
| (noun) an introductory textbook | - |
| programmer | (noun) a person who designs and writes and tests computer programs | Synonyms: coder, computer programmer, software engineer |
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| rammer | (noun) a tool for driving something with force | - |
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| reamer | (noun) a drill that is used to shape or enlarge holes | - |
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| (noun) a squeezer with a conical ridged center that is used for squeezing juice from citrus fruit | Synonyms: juice reamer, juicer |
| redeemer | (noun) someone who redeems or buys back (promissory notes or merchandise or commercial paper etc.) | - |
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| reformer | (noun) an apparatus that reforms the molecular structure of hydrocarbons to produce richer fuel | - |
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| (noun) a disputant who advocates reform | Synonyms: crusader, meliorist, reformist, social reformer |
| rhymer | (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, rhymester, versifier |
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| roamer | (noun) someone who leads a wandering unsettled life | Synonyms: bird of passage, rover, wanderer |
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| roomer | (noun) a tenant in someone's house | Synonyms: boarder, lodger |
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| rummer | (noun) a large drinking glass (ovoid bowl on a stem) for drinking toasts | - |
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| scammer | (noun) a person who swindles you by means of deception or fraud | Synonyms: chiseler, chiseller, defrauder, gouger, grifter, swindler |
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| schemer | (noun) a planner who draws up a personal scheme of action | Synonyms: plotter |
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| screamer | (noun) a very hard hit ball | Synonyms: scorcher |
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| (noun) gooselike aquatic bird of South America having a harsh trumpeting call | - |
| (noun) a sensational newspaper headline | - |
| (noun) someone who communicates vocally in a very loud voice | Synonyms: bawler, bellower, roarer, screecher, shouter, yeller |
| shammer | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, impostor, pretender, pseud, pseudo, role player, sham |
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| (noun) someone shirking their duty by feigning illness or incapacity | Synonyms: malingerer, skulker |
| shimmer | (noun) a weak and tremulous light | Synonyms: play |
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| simmer | (noun) temperature just below the boiling point | - |
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| skimmer | (noun) gull-like seabird that flies along the surface of the water with an elongated lower mandible immersed to skim out food | - |
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| (noun) a stiff hat made of straw with a flat crown | Synonyms: boater, leghorn, Panama, Panama hat, sailor, straw hat |
| (noun) a cooking utensil used to skim fat from the surface of liquids | - |
| (noun) a rapid superficial reader | - |
| slammer | (noun) a correctional institution used to detain persons who are in the lawful custody of the government (either accused persons awaiting trial or convicted persons serving a sentence) | Synonyms: clink, gaol, jail, jailhouse, pokey, poky |
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| (noun) a person who closes things violently | - |
| sledgehammer | (noun) a heavy long-handled hammer used to drive stakes or wedges | Synonyms: maul, sledge |
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| spammer | (noun) someone who sends unwanted email (often in bulk) | - |
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| squirmer | (noun) one who can't stay still (especially a child) | Synonyms: wiggler, wriggler |
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| stammer | (noun) a speech disorder involving hesitations and involuntary repetitions of certain sounds | Synonyms: stutter |
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| steamer | (noun) an edible clam with thin oval-shaped shell found in coastal regions of the United States and Europe | Synonyms: long-neck clam, Mya arenaria, soft-shell clam, steamer clam |
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| (noun) a ship powered by one or more steam engines | Synonyms: steamship |
| (noun) a cooking utensil that can be used to cook food by steaming it | - |
| (noun) a clam that is usually steamed in the shell | Synonyms: long-neck clam, soft-shell clam, steamer clam |
| stemmer | (noun) a device for removing stems from fruit (as from grapes or apples) | - |
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| (noun) a miner's tamping bar for ramming packing in over a blasting charge | - |
| (noun) an algorithm for removing inflectional and derivational endings in order to reduce word forms to a common stem | Synonyms: stemming algorithm |
| (noun) a worker who makes or applies stems for artificial flowers | - |
| (noun) a worker who strips the stems from moistened tobacco leaves and binds the leaves together into books | Synonyms: sprigger, stripper |
| stereoisomer | (noun) any of a group of isomers in which atoms are linked in the same order but differ in their spatial arrangement. | - |
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| streamer | (noun) long strip of cloth or paper used for decoration or advertising | Synonyms: banner |
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| (noun) a long flag; often tapering | Synonyms: pennant, pennon, waft |
| (noun) a newspaper headline that runs across the full page | Synonyms: banner |
| (noun) light that streams | - |
| summer | (noun) the warmest season of the year; in the Northern Hemisphere it extends from the summer solstice to the autumnal equinox | Synonyms: summertime |
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| (noun) the period of finest development, happiness, or beauty | - |
| swimmer | (noun) a trained athlete who participates in swimming meets | - |
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| (noun) a person who travels through the water by swimming | Synonyms: bather, natator |
| tamer | (noun) an animal trainer who tames wild animals | - |
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| taxonomer | (noun) a biologist who specializes in the classification of organisms into groups on the basis of their structure and origin and behavior | Synonyms: systematist, taxonomist |
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| termer | (noun) a person who serves a specified term | - |
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| timer | (noun) a timepiece that measures a time interval and signals its end | - |
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| (noun) a regulator that activates or deactivates a mechanism at set times | - |
| (noun) (sports) an official who keeps track of the time elapsed | Synonyms: timekeeper |
| transformer | (noun) an electrical device by which alternating current of one voltage is changed to another voltage | - |
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| trimer | (noun) a polymer (or a molecule of a polymer) consisting of three identical monomers | - |
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| trimmer | (noun) joist that receives the end of a header in floor or roof framing in order to leave an opening for a staircase or chimney etc. | Synonyms: trimmer joist |
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| (noun) capacitor having variable capacitance; used for making fine adjustments | Synonyms: trimming capacitor |
| (noun) a machine that trims timber | - |
| (noun) a worker who thins out and trims trees and shrubs | Synonyms: pruner |
| triphammer | (noun) a massive power hammer; raised by a cam until released to fall under gravity | - |
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| underperformer | (noun) a business that is less successful than expected | - |
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| (noun) a student who does not perform as well as expected or as well as the IQ indicates | Synonyms: nonachiever, underachiever |
| vomer | (noun) thin trapezoidal bone of the skull forming the posterior and inferior parts of the nasal septum | - |
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| warmer | (noun) device that heats water or supplies warmth to a room | Synonyms: heater |
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