| choirmaster | (noun) the musical director of a choir | Synonyms: cantor, precentor |
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| choker | (noun) a high tight collar | Synonyms: neck ruff, ruff, ruffle |
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| (noun) necklace that fits tightly around a woman's neck | Synonyms: collar, dog collar, neckband |
| (noun) someone who kills by strangling | Synonyms: garroter, garrotter, strangler, throttler |
| (noun) an unfortunate person who is unable to perform effectively because of nervous tension or agitation | - |
| choler | (noun) a humor that was once believed to be secreted by the liver and to cause irritability and anger | Synonyms: yellow bile |
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| (noun) a strong emotion; a feeling that is oriented toward some real or supposed grievance | Synonyms: anger, ire |
| (noun) an irritable petulant feeling | Synonyms: crossness, fretfulness, fussiness, irritability, peevishness, petulance |
| chooser | (noun) a person who chooses or selects out | Synonyms: picker, selector |
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| chopper | (noun) a grounder that bounces high in the air | Synonyms: chop |
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| (noun) a butcher's knife having a large square blade | Synonyms: cleaver, meat cleaver |
| (noun) an aircraft without wings that obtains its lift from the rotation of overhead blades | Synonyms: eggbeater, helicopter, whirlybird |
| (noun) informal terms for a human `tooth' | Synonyms: pearly |
| choreographer | (noun) someone who creates new dances | - |
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| chorister | (noun) a singer in a choir | - |
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| chowder | (noun) a thick soup or stew made with milk and bacon and onions and potatoes | - |
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| chronicler | (noun) someone who writes chronicles | - |
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| chronometer | (noun) an accurate clock (especially used in navigation) | - |
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| chuddar | (noun) a cloth used as a head covering (and veil and shawl) by Muslim and Hindu women | Synonyms: chadar, chaddar, chador |
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| chukker | (noun) (polo) one of six divisions into which a polo match is divided | Synonyms: chukka |
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| churchgoer | (noun) a religious person who goes to church regularly | Synonyms: church member |
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| cider | (noun) a beverage made from juice pressed from apples | Synonyms: cyder |
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| cigar | (noun) a roll of tobacco for smoking | - |
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| cinder | (noun) a fragment of incombustible matter left after a wood or coal or charcoal fire | Synonyms: clinker |
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| cinematographer | (noun) a photographer who operates a movie camera | Synonyms: camera operator, cameraman |
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| cinnabar | (noun) large red-and-black European moth; larvae feed on leaves of ragwort; introduced into United States to control ragwort | Synonyms: Callimorpha jacobeae, cinnabar moth |
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| (noun) a heavy reddish mineral consisting of mercuric sulfide; the chief source of mercury | - |
| cipher | (noun) a secret method of writing | Synonyms: cryptograph, cypher, secret code |
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| (noun) a message written in a secret code | Synonyms: cypher |
| (noun) a person of no influence | Synonyms: cypher, nobody, nonentity |
| (noun) a quantity of no importance; thing (object:), singular, negative pronoun; pronoun, thing, singular; quantifier: negative existential | Synonyms: aught, cypher, goose egg, nada, naught, nil, nix, nothing, null, zero, zilch, zip, zippo |
| (noun) a mathematical element that when added to another number yields the same number | Synonyms: 0, cypher, nought, zero |
| circular | (noun) an advertisement (usually printed on a page or in a leaflet) intended for wide distribution | Synonyms: bill, broadsheet, broadside, flier, flyer, handbill, throwaway |
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| cither | (noun) a musical stringed instrument with strings stretched over a flat sounding board; it is laid flat and played with a plectrum and with fingers | Synonyms: zither, zithern |
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| (noun) a 16th century musical instrument resembling a guitar with a pear-shaped soundbox and wire strings | Synonyms: cithern, citole, cittern, gittern |
| clabber | (noun) raw milk that has soured and thickened | - |
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| clamber | (noun) an awkward climb | - |
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| clamor | (noun) loud and persistent outcry from many people | Synonyms: clamoring, clamour, clamouring, hue and cry |
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| (noun) a loud harsh or strident noise | Synonyms: blare, blaring, cacophony, din |
| clamour | (noun) loud and persistent outcry from many people | Synonyms: clamor, clamoring, clamouring, hue and cry |
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| clanger | (noun) a conspicuous mistake whose effects seem to reverberate | - |
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| clangor | (noun) a loud resonant repeating noise | Synonyms: clang, clangoring, clangour, clank, clash, crash |
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| clangour | (noun) a loud resonant repeating noise | Synonyms: clang, clangor, clangoring, clank, clash, crash |
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| clanker | (noun) something that makes a clanking noise. | - |
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| clapper | (noun) metal striker that hangs inside a bell and makes a sound by hitting the side | Synonyms: tongue |
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| (noun) a mobile mass of muscular tissue covered with mucous membrane and located in the oral cavity | Synonyms: glossa, lingua, tongue |
| (noun) someone who applauds | Synonyms: applauder |
| classifier | (noun) an algorithm that implements classification. | - |
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| (noun) a word or morpheme used in some languages in certain contexts (such as counting) to indicate the semantic class to which the counted item belongs | - |
| (noun) a person who creates classifications | - |
| clatter | (noun) a rattling noise (often produced by rapid movement) | - |
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| clavier | (noun) a bank of keys on a musical instrument | Synonyms: fingerboard, piano keyboard |
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| (noun) a stringed instrument that has a keyboard | Synonyms: Klavier |
| clawhammer | (noun) a hammer with a cleft at one end for pulling nails | Synonyms: carpenter's hammer, claw hammer |
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| cleaner | (noun) a preparation used in cleaning something | Synonyms: cleanser, cleansing agent |
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| (noun) someone whose occupation is cleaning | - |
| (noun) the operator of dry-cleaning establishment | Synonyms: dry cleaner |
| cleanser | (noun) a preparation used in cleaning something | Synonyms: cleaner, cleansing agent |
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| clear | (noun) a clear or unobstructed space or expanse of land or water | Synonyms: open |
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| (noun) the state of being free of suspicion | - |
| cleaver | (noun) a butcher's knife having a large square blade | Synonyms: chopper, meat cleaver |
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| cliffhanger | (noun) an episode that ends in suspense | - |
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| (noun) a contest whose outcome is uncertain up to the very end | - |
| climber | (noun) an iron spike attached to the shoe to prevent slipping on ice when walking or climbing | Synonyms: climbing iron, crampon, crampoon |
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| (noun) someone who climbs as a sport; especially someone who climbs mountains | - |
| (noun) someone seeking social prominence by obsequious behavior | Synonyms: social climber |
| (noun) someone who ascends on foot | Synonyms: mounter |
| (noun) a vine or climbing plant that readily grows up a support or over other plants | - |
| clincher | (noun) a tool used to clinch nails or bolts or rivets | - |
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| (noun) a point or fact or remark that settles something conclusively | Synonyms: decisive factor |
| (noun) an argument that is conclusive | Synonyms: determiner, determining factor |
| clinker | (noun) a hard brick used as a paving stone | Synonyms: clinker brick |
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| (noun) a fragment of incombustible matter left after a wood or coal or charcoal fire | Synonyms: cinder |
| clinometer | (noun) an instrument used by surveyors in order to measure an angle of inclination or elevation | Synonyms: inclinometer |
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| clipper | (noun) scissors for cutting hair or finger nails | - |
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| (noun) shears for cutting grass or shrubbery | - |
| (noun) a fast sailing ship used in former times | Synonyms: clipper ship |
| (noun) (electronics) a nonlinear electronic circuit whose output is limited in amplitude; used to limit the instantaneous amplitude of a waveform (to clip off the peaks of a waveform) | Synonyms: limiter |
| cloakmaker | (noun) someone whose occupation is making or repairing fur garments | Synonyms: furrier |
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| clobber | (noun) informal terms for personal possessions | Synonyms: stuff |
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| clockmaker | (noun) someone whose occupation is making or repairing clocks and watches | Synonyms: clocksmith |
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| clodhopper | (noun) a thick and heavy shoe | Synonyms: brogan, brogue, work shoe |
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| cloister | (noun) residence that is a place of religious seclusion (such as a monastery) | Synonyms: religious residence |
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| (noun) a courtyard with covered walks (as in religious institutions) | - |
| closer | (noun) (baseball) a relief pitcher who can protect a lead in the last inning or two of the game | Synonyms: finisher |
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| (noun) a person who closes something | - |
| clotbur | (noun) any of several erect biennial herbs of temperate Eurasia having stout taproots and producing burs | Synonyms: burdock |
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| clothier | (noun) a merchant who sells men's clothing | Synonyms: haberdasher |
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| clover | (noun) a plant of the genus Trifolium | Synonyms: trefoil |
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| clowder | (noun) a group of cats | - |
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| clumber | (noun) a thickset spaniel with longish silky hair | Synonyms: clumber spaniel |
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| cluster | (noun) a grouping of a number of similar things | Synonyms: bunch, clump, clustering |
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| clutter | (noun) unwanted echoes that interfere with the observation of signals on a radar screen | - |
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| (noun) a confused multitude of things | Synonyms: fuddle, jumble, mare's nest, muddle, smother, welter |
| clyster | (noun) an injection of a liquid through the anus to stimulate evacuation; sometimes used for diagnostic purposes | Synonyms: enema |
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| coachbuilder | (noun) a craftsman who makes the bodies of motor vehicles | - |
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| coadjutor | (noun) an assistant to a bishop | - |
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| coagulator | (noun) an agent that produces coagulation | Synonyms: coagulant |
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| coaster | (noun) a covering (plate or mat) that protects the surface of a table (i.e., from the condensation on a cold glass or bottle) | - |
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| (noun) someone who coasts | - |
| (noun) a resident of a coastal area | - |
| coauthor | (noun) a writer who collaborates with others in writing something | Synonyms: joint author |
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| coaxer | (noun) someone who tries to persuade by blandishment and coaxing | Synonyms: wheedler |
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| cobber | (noun) Australian term for a pal | - |
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| cobbler | (noun) a pie made of fruit with rich biscuit dough usually only on top of the fruit | Synonyms: deep-dish pie |
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| (noun) tall sweetened iced drink of wine or liquor with fruit | - |
| (noun) a person who makes or repairs shoes | Synonyms: shoemaker |
| cockchafer | (noun) any of various large European beetles destructive to vegetation as both larvae and adult | Synonyms: May beetle, May bug, Melolontha melolontha |
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| cocker | (noun) a small breed with wavy silky hair; originally developed in England | Synonyms: cocker spaniel, English cocker spaniel |
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| cocklebur | (noun) any coarse weed of the genus Xanthium having spiny burrs | Synonyms: cockle-bur, cockle-burr, cockleburr |
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| (noun) burdock having heart-shaped leaves found in open woodland, hedgerows and rough grassland of Europe (except extreme N) and Asia Minor; sometimes cultivated for medicinal and culinary use | Synonyms: Arctium lappa, great burdock, greater burdock |
| cockleburr | (noun) any coarse weed of the genus Xanthium having spiny burrs | Synonyms: cockle-bur, cockle-burr, cocklebur |
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| cockspur | (noun) small spiny West Indian tree | Synonyms: Pisonia aculeata |
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| (noun) widely grown stout Old World hay and pasture grass | Synonyms: cocksfoot, Dactylis glomerata, orchard grass |
| cocksucker | (noun) insulting terms of address for people who are stupid or irritating or ridiculous | Synonyms: asshole, bastard, dickhead, mother fucker, motherfucker, prick, shit, SOB, son of a bitch, whoreson |
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| (noun) a person who performs fellatio | - |
| coconspirator | (noun) a member of a conspiracy | Synonyms: conspirator, machinator, plotter |
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| coddler | (noun) someone who pampers or spoils by excessive indulgence | Synonyms: mollycoddler, pamperer, spoiler |
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| coder | (noun) a person who designs and writes and tests computer programs | Synonyms: computer programmer, programmer, software engineer |
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| codetalker | (noun) a secret agent who was one of the Navajos who devised and used a code based on their native language; the code was unbroken by the Japanese during World War II | Synonyms: windtalker |
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| codger | (noun) used affectionately to refer to an eccentric but amusing old man | Synonyms: old codger |
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| cofactor | (noun) a substance (as a coenzyme) that must join with another to produce a given result | - |
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| coffer | (noun) a chest especially for storing valuables | - |
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| (noun) an ornamental sunken panel in a ceiling or dome | Synonyms: caisson, lacunar |
| cofounder | (noun) one of a group of founders | - |
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| coiffeur | (noun) a man hairdresser | - |
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| coiner | (noun) a skilled worker who coins or stamps money | Synonyms: minter, moneyer |
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| (noun) someone who is a source of new words or new expressions | - |
| (noun) a maker of counterfeit coins | - |
| coir | (noun) stiff coarse fiber from the outer husk of a coconut | - |
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| colander | (noun) bowl-shaped strainer; used to wash or drain foods | Synonyms: cullender |
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| collaborator | (noun) an associate in an activity or endeavor or sphere of common interest | Synonyms: cooperator, pardner, partner |
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| (noun) someone who collaborates with an enemy occupying force | Synonyms: collaborationist, quisling |
| (noun) someone who assists in a plot | Synonyms: confederate, henchman, partner in crime |
| collar | (noun) the act of apprehending (especially apprehending a criminal) | Synonyms: apprehension, arrest, catch, pinch, taking into custody |
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| (noun) a figurative restraint | Synonyms: leash |
| (noun) a band that fits around the neck and is usually folded over | Synonyms: neckband |
| (noun) necklace that fits tightly around a woman's neck | Synonyms: choker, dog collar, neckband |
| (noun) a band of leather or rope that is placed around an animal's neck as a harness or to identify it | - |
| (noun) the stitching that forms the rim of a shoe or boot | Synonyms: shoe collar |
| (noun) a short ring fastened over a rod or shaft to limit, guide, or secure a machine part | - |
| (noun) anything worn or placed about the neck | - |
| (noun) (zoology) an encircling band or marking around the neck of any animal | - |
| collator | (noun) a machine that selects, merges and matches decks of punch cards. | - |
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| collector | (noun) the electrode in a transistor through which a primary flow of carriers leaves the region between the electrodes | - |
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| (noun) a crater that has collected cosmic material hitting the earth | - |
| (noun) a person who is employed to collect payments (as for rent or taxes) | Synonyms: accumulator, gatherer |
| (noun) a person who collects things | Synonyms: aggregator |
| collider | (noun) an accelerator in which two beams of particles are forced to collide head on | - |
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| collier | (noun) someone who works in a coal mine | Synonyms: coal miner, pitman |
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| collimator | (noun) optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam | - |
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| (noun) a small telescope attached to a large telescope to use in setting the line of the larger one | - |
| coloniser | (noun) someone who helps to found a colony | Synonyms: colonizer |
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| colonizer | (noun) someone who helps to found a colony | Synonyms: coloniser |
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| color | (noun) a visual attribute of things that results from the light they emit or transmit or reflect | Synonyms: coloring, colour, colouring |
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| (noun) the appearance of objects (or light sources) described in terms of a person's perception of their hue and lightness (or brightness) and saturation | Synonyms: colour |
| (noun) the timbre of a musical sound | Synonyms: coloration, colour, colouration |
| (noun) interest and variety and intensity | Synonyms: colour, vividness |
| (noun) an outward or token appearance or form that is deliberately misleading | Synonyms: colour, gloss, semblance |
| (noun) (physics) the characteristic of quarks that determines their role in the strong interaction | Synonyms: colour |
| (noun) any material used for its color | Synonyms: coloring material, colour, colouring material |
| colorimeter | (noun) a measuring instrument used in colorimetric analysis to determine the quantity of a substance from the color it yields with specific reagents | Synonyms: tintometer |
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| colour | (noun) a visual attribute of things that results from the light they emit or transmit or reflect | Synonyms: color, coloring, colouring |
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| (noun) the appearance of objects (or light sources) described in terms of a person's perception of their hue and lightness (or brightness) and saturation | Synonyms: color |
| (noun) the timbre of a musical sound | Synonyms: color, coloration, colouration |
| (noun) interest and variety and intensity | Synonyms: color, vividness |
| (noun) an outward or token appearance or form that is deliberately misleading | Synonyms: color, gloss, semblance |
| (noun) (physics) the characteristic of quarks that determines their role in the strong interaction | Synonyms: color |
| (noun) any material used for its color | Synonyms: color, coloring material, colouring material |
| colter | (noun) a sharp steel wedge that precedes the plow and cuts vertically through the soil | Synonyms: coulter |
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| comber | (noun) a machine that separates and straightens the fibers of cotton or wool | - |
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| (noun) a long curling sea wave | - |
| (noun) a person who separates and straightens the fibers of cotton or wool | - |
| comer | (noun) someone who arrives (or has arrived) | Synonyms: arrival, arriver |
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| (noun) someone with a promising future | - |
| comforter | (noun) bedding made of two layers of cloth filled with stuffing and stitched together | Synonyms: comfort, puff, quilt |
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| (noun) device used for an infant to suck or bite on | Synonyms: baby's dummy, pacifier, teething ring |
| (noun) a person who commiserates with someone who has had misfortune | Synonyms: sympathiser, sympathizer |
| (noun) a person who reduces the intensity (e.g., of fears) and calms and pacifies | Synonyms: allayer, reliever |