| asserter | (noun) someone who claims to speak the truth | Synonyms: affirmer, asseverator, avower, declarer |
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| assessor | (noun) an official who evaluates property for the purpose of taxing it | Synonyms: tax assessor |
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| asseverator | (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, avower, declarer |
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| assignor | (noun) (law) the party who makes an assignment | - |
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| assimilator | (noun) someone (especially a child) who learns (as from a teacher) or takes up knowledge or beliefs | Synonyms: learner, scholar, student |
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| aster | (noun) star-shaped structure formed in the cytoplasm of a cell having fibers like rays that surround the centrosome during mitosis | - |
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| (noun) any of various chiefly fall-blooming herbs of the genus Aster with showy daisylike flowers | - |
| astrogator | (noun) the navigator of a spacecraft | - |
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| astrologer | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologist |
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| astronomer | (noun) a physicist who studies astronomy | Synonyms: stargazer, uranologist |
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| atar | (noun) essential oil or perfume obtained from flowers | Synonyms: athar, attar, ottar |
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| atelier | (noun) a studio especially for an artist or designer | Synonyms: artist's workroom |
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| athanor | (noun) a furnace that feeds itself so as to maintain a uniform temperature; used by alchemists | - |
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| athar | (noun) essential oil or perfume obtained from flowers | Synonyms: atar, attar, ottar |
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| atmometer | (noun) an instrument that measures rate of evaporation of water | Synonyms: evaporometer |
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| atomiser | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomizer, nebuliser, nebulizer, spray, sprayer |
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| atomizer | (noun) a dispenser that turns a liquid (such as perfume) into a fine mist | Synonyms: atomiser, nebuliser, nebulizer, spray, sprayer |
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| attacker | (noun) someone who attacks | Synonyms: aggressor, assailant, assaulter |
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| attainder | (noun) cancellation of civil rights | Synonyms: civil death |
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| attar | (noun) essential oil or perfume obtained from flowers | Synonyms: atar, athar, ottar |
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| attempter | (noun) one who tries | Synonyms: essayer, trier |
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| attender | (noun) someone who waits on or tends to or attends to the needs of another | Synonyms: attendant, tender |
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| (noun) a person who is present and participates in a meeting | Synonyms: attendant, attendee, meeter |
| (noun) someone who listens attentively | Synonyms: auditor, hearer, listener |
| attenuator | (noun) an electrical device for attenuating the strength of an electrical signal | - |
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| attestator | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestant, attestor, witness |
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| attester | (noun) someone who affirms or vouches for the correctness or truth or genuineness of something | Synonyms: attestant |
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| attestor | (noun) (law) a person who attests to the genuineness of a document or signature by adding their own signature | Synonyms: attestant, attestator, witness |
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| attracter | (noun) a characteristic that provides pleasure and attracts | Synonyms: attraction, attractive feature, attractor, magnet |
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| (noun) (physics) a point in the ideal multidimensional phase space that is used to describe a system toward which the system tends to evolve regardless of the starting conditions of the system | Synonyms: attractor |
| (noun) an entertainer who attracts large audiences | Synonyms: attraction, attractor, draw, drawing card |
| attractor | (noun) a characteristic that provides pleasure and attracts | Synonyms: attracter, attraction, attractive feature, magnet |
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| (noun) (physics) a point in the ideal multidimensional phase space that is used to describe a system toward which the system tends to evolve regardless of the starting conditions of the system | Synonyms: attracter |
| (noun) an entertainer who attracts large audiences | Synonyms: attracter, attraction, draw, drawing card |
| auctioneer | (noun) an agent who conducts an auction | - |
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| audiometer | (noun) an instrument used to measure the sensitivity of hearing | Synonyms: sonometer |
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| auditor | (noun) a qualified accountant who inspects the accounting records and practices of a business or other organization | - |
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| (noun) someone who listens attentively | Synonyms: attender, hearer, listener |
| (noun) a student who attends a course but does not take it for credit | - |
| auger | (noun) hand tool for boring holes | Synonyms: gimlet, screw auger, wimble |
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| (noun) a long flexible steel coil for dislodging stoppages in curved pipes | Synonyms: plumber's snake, snake |
| augur | (noun) (ancient Rome) a religious official who interpreted omens to guide public policy | Synonyms: auspex |
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| auteur | (noun) a filmmaker who has a personal style and keeps creative control over his or her works | - |
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| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| author | (noun) writes (books or stories or articles or the like) professionally (for pay) | Synonyms: writer |
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| (noun) someone who originates or causes or initiates something | Synonyms: generator, source |
| authoriser | (noun) an authority who authorizes (people or actions) | Synonyms: authorizer |
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| authorizer | (noun) an authority who authorizes (people or actions) | Synonyms: authoriser |
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| autobiographer | (noun) someone who writes their own biography | - |
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| autoinjector | (noun) a hypodermic syringe to use in injecting yourself with a liquid | - |
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| autoloader | (noun) a firearm that reloads itself | Synonyms: self-loader |
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| automaker | (noun) a business engaged in the manufacture of automobiles | Synonyms: auto maker, auto manufacturer, car maker, car manufacturer, carmaker |
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| avatar | (noun) the manifestation of a Hindu deity (especially Vishnu) in human or superhuman or animal form | - |
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| (noun) a new personification of a familiar idea | Synonyms: embodiment, incarnation |
| avenger | (noun) someone who takes vengeance | Synonyms: retaliator |
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| aviator | (noun) someone who operates an aircraft | Synonyms: aeronaut, flier, flyer |
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| avower | (noun) someone who admits or acknowledges openly and boldly | - |
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| (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, asseverator, declarer |
| babbler | (noun) any of various insectivorous Old World birds with a loud incessant song; in some classifications considered members of the family Muscicapidae | Synonyms: cackler |
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| (noun) an obnoxious and foolish and loquacious talker | Synonyms: chatterbox, chatterer, magpie, prater, spouter |
| babyminder | (noun) a person who looks after babies (usually in the person's own home) while the babys' parents are working | Synonyms: baby minder, minder |
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| babysitter | (noun) a person engaged to care for children when the parents are not home | Synonyms: baby-sitter, sitter |
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| bachelor | (noun) a man who has never been married | Synonyms: unmarried man |
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| (noun) a knight of the lowest order; could display only a pennon | Synonyms: bachelor-at-arms, knight bachelor |
| backbencher | (noun) a member of the House of Commons who is not a party leader | - |
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| backbiter | (noun) one who attacks the reputation of another by slander or libel | Synonyms: defamer, libeler, maligner, slanderer, traducer, vilifier |
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| backdoor | (noun) a secret or underhand means of access (to a place or a position) | Synonyms: back door |
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| (noun) an entrance at the rear of a building | Synonyms: back door, back entrance |
| (noun) an undocumented way to get access to a computer system or the data it contains | Synonyms: back door |
| backer | (noun) someone who provides financial support for some venture | Synonyms: angel |
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| backgrounder | (noun) a press conference or interview in which a government official explains to reporters the background of an action or policy | - |
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| backhander | (noun) a backhanded blow | - |
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| backpacker | (noun) a hiker who wears a backpack | Synonyms: packer |
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| backscratcher | (noun) a long-handled scratcher for scratching your back | - |
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| (noun) someone who is willing to trade favors or services for mutual advantage | - |
| backslapper | (noun) someone who demonstrates enthusiastic or excessive cordiality | - |
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| backslider | (noun) someone who lapses into previous undesirable patterns of behavior | Synonyms: recidivist, reversionist |
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| backspacer | (noun) the typewriter key used for back spacing | Synonyms: backspace, backspace key |
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| backstroker | (noun) someone who swims the backstroke | - |
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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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| backwater | (noun) a place or condition in which no development or progress is occurring | - |
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| (noun) a body of water that was created by a flood or tide or by being held or forced back by a dam | - |
| badger | (noun) sturdy carnivorous burrowing mammal with strong claws; widely distributed in the Northern Hemisphere | - |
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| badgerer | (noun) someone who tries to embarrass you with gibes and questions and objections | Synonyms: heckler |
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| baedeker | (noun) any of a series of travel guidebooks published by the German firm founded by Karl Baedeker | - |
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| bagger | (noun) a machine for putting objects or substances into bags | - |
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| (noun) a workman employed to pack things into containers | Synonyms: boxer, packer |
| bagpiper | (noun) someone who plays the bagpipe | Synonyms: piper |
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| bailor | (noun) the person who delivers personal property (goods or money) in trust to the bailee in a bailment | - |
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| baker | (noun) someone who bakes bread or cake | Synonyms: bread maker |
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| (noun) someone who bakes commercially | - |
| balancer | (noun) either of the rudimentary hind wings of dipterous insects; used for maintaining equilibrium during flight | Synonyms: halter, haltere |
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| (noun) an acrobat who balances himself in difficult positions | - |
| balker | (noun) a person who refuses to comply | Synonyms: baulker, noncompliant |
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| balladeer | (noun) a singer of popular ballads | Synonyms: crooner |
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| ballplayer | (noun) an athlete who plays baseball | Synonyms: baseball player |
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| baluster | (noun) one of a number of closely spaced supports for a railing | - |
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| bandleader | (noun) the leader of a dance band | - |
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| bandmaster | (noun) the conductor of a band | - |
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| bandoleer | (noun) a broad cartridge belt worn over the shoulder by soldiers | Synonyms: bandolier |
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| bandolier | (noun) a broad cartridge belt worn over the shoulder by soldiers | Synonyms: bandoleer |
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| banger | (noun) firework consisting of a small explosive charge and fuse in a heavy paper casing | Synonyms: cracker, firecracker |
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| (noun) (British informal) pork sausage | - |
| banister | (noun) a railing at the side of a staircase or balcony to prevent people from falling | Synonyms: balusters, balustrade, bannister, handrail |
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| banker | (noun) a financier who owns or is an executive in a bank | - |
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| (noun) the person in charge of the bank in a gambling game | - |
| banner | (noun) long strip of cloth or paper used for decoration or advertising | Synonyms: streamer |
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| (noun) any distinctive flag | Synonyms: standard |
| (noun) a newspaper headline that runs across the full page | Synonyms: streamer |
| bannister | (noun) a railing at the side of a staircase or balcony to prevent people from falling | Synonyms: balusters, balustrade, banister, handrail |
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| banter | (noun) light teasing repartee | Synonyms: backchat, give-and-take, raillery |
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| bar | (noun) the act of preventing | Synonyms: prevention |
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| (noun) a rigid piece of metal or wood; usually used as a fastening or obstruction or weapon | - |
| (noun) an obstruction (usually metal) placed at the top of a goal | - |
| (noun) a room or establishment where alcoholic drinks are served over a counter | Synonyms: barroom, ginmill, saloon, taproom |
| (noun) a counter where you can obtain food or drink | - |
| (noun) a block of solid substance (such as soap or wax) | Synonyms: cake |
| (noun) (law) a railing that encloses the part of the courtroom where the judges and lawyers sit and the case is tried | - |
| (noun) a heating element in an electric fire | - |
| (noun) a horizontal rod that serves as a support for gymnasts as they perform exercises | - |
| (noun) a narrow marking of a different color or texture from the background | Synonyms: streak, stripe |
| (noun) musical notation for a repeating pattern of musical beats | Synonyms: measure |
| (noun) the body of individuals qualified to practice law in a particular jurisdiction | Synonyms: legal community, legal profession |
| (noun) a submerged (or partly submerged) ridge in a river or along a shore | - |
| (noun) (meteorology) a unit of pressure equal to a million dynes per square centimeter | - |
| barber | (noun) a hairdresser who cuts hair and shaves beards as a trade | - |
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| bargainer | (noun) someone who purchases and maintains an inventory of goods to be sold | Synonyms: dealer, monger, trader |
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| (noun) negotiator of the terms of a transaction | - |
| barkeeper | (noun) an employee who mixes and serves alcoholic drinks at a bar | Synonyms: barkeep, bartender, mixologist |
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| barker | (noun) informal terms for dogs | Synonyms: bow-wow, doggie, doggy, pooch |
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| (noun) someone who stands in front of a show (as at a carnival) and gives a loud colorful sales talk to potential customers | - |
| barnburner | (noun) an impressively successful event | - |
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| (noun) someone who burns down a barn | - |
| barndoor | (noun) an opaque adjustable flap on a lamp fixture; used in photography to cut off light from particular areas | - |
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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 |
| barometer | (noun) an instrument that measures atmospheric pressure | - |
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| baroreceptor | (noun) a sensory receptor that responds to pressure | - |
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| barosaur | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaurus |
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| barrater | (noun) someone guilty of barratry | Synonyms: barrator |
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| barrator | (noun) someone guilty of barratry | Synonyms: barrater |
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| barretter | (noun) a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations) | Synonyms: ballast, ballast resistor |
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| barrier | (noun) a structure or object that impedes free movement | - |
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| (noun) any condition that makes it difficult to make progress or to achieve an objective | Synonyms: roadblock |
| (noun) anything serving to maintain separation by obstructing vision or access | - |