| abiogenist | (noun) a believer in abiogenesis | - |
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| abolitionist | (noun) a reformer who favors abolishing slavery | Synonyms: emancipationist |
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| abortionist | (noun) a person (who should be a doctor) who terminates pregnancies | - |
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| absolutist | (adjective) pertaining to the principle of totalitarianism | Synonyms: absolutistic |
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| (noun) one who advocates absolutism | - |
| abstractionist | (adjective) not representing or imitating external reality or the objects of nature | Synonyms: abstract, nonfigurative, nonobjective |
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| (noun) a painter of abstract pictures | Synonyms: abstract artist |
| accompanist | (noun) a person who provides musical accompaniment (usually on a piano) | Synonyms: accompanyist |
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| accompanyist | (noun) a person who provides musical accompaniment (usually on a piano) | Synonyms: accompanist |
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| accordionist | (noun) a musician who plays the accordion | - |
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| activist | (adjective) advocating or engaged in activism | Synonyms: activistic |
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| (noun) a militant reformer | Synonyms: militant |
| aerialist | (noun) an acrobat who performs in the air (as on a rope or trapeze) | - |
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| aetiologist | (noun) a specialist in the etiology of diseases | Synonyms: etiologist |
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| agonist | (noun) (biochemistry) a drug that can combine with a receptor on a cell to produce a physiological reaction | - |
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| (noun) a muscle that contracts while another relaxes | - |
| (noun) someone involved in a contest or battle (as in an agon) | - |
| (noun) the principal character in a work of fiction | Synonyms: protagonist |
| agriculturalist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturist, cultivator, grower, raiser |
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| agriculturist | (noun) someone concerned with the science or art or business of cultivating the soil | Synonyms: agriculturalist, cultivator, grower, raiser |
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| agronomist | (noun) an expert in soil management and field-crop production | - |
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| alarmist | (noun) a person who alarms others needlessly | - |
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| alchemist | (noun) one who was versed in the practice of alchemy and who sought an elixir of life and a panacea and an alkahest and the philosopher's stone | - |
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| algebraist | (noun) a mathematician whose specialty is algebra | - |
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| alienist | (noun) a psychiatrist and specialist in the legal aspects of mental illness | - |
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| allergist | (noun) a physician skilled in the diagnosis and treatment of allergies | - |
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| alpinist | (noun) a mountain climber who specializes in difficult climbs | - |
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| altoist | (noun) a musician who plays the alto saxophone | Synonyms: alto saxophonist |
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| altruist | (noun) someone who makes charitable donations intended to increase human well-being | Synonyms: philanthropist |
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| amoralist | (noun) someone who adheres to the doctrine that ordinary moral distinctions are invalid | - |
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| amorist | (noun) one dedicated to love and lovemaking especially one who writes about love | - |
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| anaesthetist | (noun) a specialist who administers an anesthetic to a patient before he is treated | Synonyms: anesthesiologist, anesthetist |
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| analogist | (noun) someone who looks for analogies or who reasons by analogy | - |
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| anarchist | (noun) an advocate of anarchism | Synonyms: nihilist, syndicalist |
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| anatomist | (noun) an expert in anatomy | - |
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| anecdotist | (noun) a person skilled in telling anecdotes | Synonyms: raconteur |
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| anesthesiologist | (noun) a specialist who administers an anesthetic to a patient before he is treated | Synonyms: anaesthetist, anesthetist |
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| anesthetist | (noun) a specialist who administers an anesthetic to a patient before he is treated | Synonyms: anaesthetist, anesthesiologist |
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| angiologist | (noun) a physician who specializes in angiology | - |
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| animist | (adjective) of or pertaining to the doctrine of animism | Synonyms: animistic |
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| (noun) one who accepts the doctrine of animism | - |
| annalist | (noun) a historian who writes annals | - |
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| anomalist | (noun) someone who has a special interest in exceptional cases | - |
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| antagonist | (noun) a drug that neutralizes or counteracts the effects of another drug | - |
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| (noun) a muscle that relaxes while another contracts | - |
| (noun) someone who offers opposition | Synonyms: adversary, opponent, opposer, resister |
| anthologist | (noun) an editor who makes selections for an anthology | - |
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| anthropologist | (noun) a social scientist who specializes in anthropology | - |
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| antifeminist | (noun) someone who does not believe in the social or economic or political equality of men and women | - |
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| aorist | (noun) a verb tense in some languages (classical Greek and Sanskrit) expressing action (especially past action) without indicating its completion or continuation | - |
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| aphorist | (noun) someone who formulates aphorisms or who repeats aphorisms | - |
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| apiarist | (noun) a farmer who keeps bees for their honey | Synonyms: apiculturist, beekeeper |
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| apiculturist | (noun) a farmer who keeps bees for their honey | Synonyms: apiarist, beekeeper |
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| apologist | (noun) a person who argues to defend or justify some policy or institution | Synonyms: justifier, vindicator |
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| arbalist | (noun) late version of the crossbow with a steel bow | Synonyms: arbalest |
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| (noun) archer who uses an arbalest | - |
| arboriculturist | (noun) someone trained in forestry | Synonyms: forester, tree farmer |
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| arborist | (noun) a specialist in treating damaged trees | Synonyms: tree surgeon |
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| archaeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archeologist |
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| archaist | (noun) an expert or collector of antiquities | Synonyms: antiquarian, antiquary |
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| (noun) a person who archaizes | - |
| archeologist | (noun) an anthropologist who studies prehistoric people and their culture | Synonyms: archaeologist |
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| archivist | (noun) a person in charge of collecting and cataloguing archives | - |
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| arianist | (noun) an adherent of Arianism (the belief that Jesus Christ was not truly God) | - |
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| arsonist | (noun) a criminal who illegally sets fire to property | Synonyms: firebug, incendiary |
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| artist | (noun) a person whose creative work shows sensitivity and imagination | Synonyms: creative person |
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| assist | (noun) (sports) the act of enabling another player to make a good play | - |
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| (noun) the activity of contributing to the fulfillment of a need or furtherance of an effort or purpose | Synonyms: aid, assistance, help |
| (verb) act as an assistant in a subordinate or supportive function | - |
| (verb) work for, or be a servant to | Synonyms: attend, attend to, serve, wait on |
| (verb) give help or assistance; be of service | Synonyms: aid, help |
| astrologist | (noun) someone who predicts the future by the positions of the planets and sun and Moon | Synonyms: astrologer |
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| astrophysicist | (noun) an astronomer who studies the physical properties of celestial bodies | - |
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| atavist | (noun) an organism that has the characteristics of a more primitive type of that organism | Synonyms: throwback |
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| atheist | (adjective) related to or characterized by or given to atheism | Synonyms: atheistic, atheistical |
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| (noun) someone who does not believe in the existence of a god | - |
| automobilist | (noun) someone who drives (or travels in) an automobile | Synonyms: motorist |
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| bacteriologist | (noun) a biologist who studies bacteria | - |
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| balloonist | (noun) someone who flies a balloon | - |
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| bassist | (noun) a musician who play the bass viol | - |
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| bassoonist | (noun) a musician who plays the bassoon | - |
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| behaviorist | (adjective) of or relating to behaviorism | Synonyms: behavioristic, behaviourist, behaviouristic |
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| (noun) a psychologist who subscribes to behaviorism | Synonyms: behaviourist |
| behaviourist | (adjective) of or relating to behaviorism | Synonyms: behaviorist, behavioristic, behaviouristic |
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| (noun) a psychologist who subscribes to behaviorism | Synonyms: behaviorist |
| bibliopolist | (noun) a dealer in secondhand books (especially rare or curious books) | Synonyms: bibliopole |
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| bibliotist | (noun) someone who engages in bibliotics | - |
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| bicyclist | (noun) a person who rides a bicycle | Synonyms: bicycler, biker, cyclist, wheeler |
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| bigamist | (noun) someone who marries one person while already legally married to another | - |
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| bilingualist | (noun) a person who speaks two languages fluently | Synonyms: bilingual |
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| bimetallist | (noun) an advocate of bimetallism | - |
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| biochemist | (noun) someone with special training in biochemistry | - |
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| biologist | (noun) (biology) a scientist who studies living organisms | Synonyms: life scientist |
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| biophysicist | (noun) a physicist who applies the methods of physics to biology | - |
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| blacklist | (noun) a list of people who are out of favor | Synonyms: black book, shitlist |
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| (verb) put on a blacklist so as to banish or cause to be boycotted | - |
| bonavist | (noun) perennial twining vine of Old World tropics having trifoliate leaves and racemes of fragrant purple pea-like flowers followed by maroon pods of edible seeds; grown as an ornamental and as a vegetable on the Indian subcontinent; sometimes placed in genus Dolichos | Synonyms: Dolichos lablab, Egyptian bean, hyacinth bean, Indian bean, Lablab purpureus |
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| botanist | (noun) a biologist specializing in the study of plants | Synonyms: phytologist, plant scientist |
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| bugologist | (noun) a zoologist who studies insects | Synonyms: bug-hunter, entomologist |
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| cabalist | (noun) an expert who is highly skilled in obscure or difficult or esoteric matters | Synonyms: kabbalist |
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| (noun) a member of a cabal | - |
| calligraphist | (noun) someone skilled in penmanship | Synonyms: calligrapher |
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| canoeist | (noun) someone paddling a canoe | Synonyms: paddler |
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| canonist | (adjective) pertaining to or characteristic of a body of rules and principles accepted as axiomatic; e.g. "canonist communism" | - |
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| (noun) a specialist in canon law | - |
| capitalist | (adjective) favoring or practicing capitalism | Synonyms: capitalistic |
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| (adjective) of or relating to capitalism or capitalists | Synonyms: capitalistic |
| (noun) a person who invests capital in a business (especially a large business) | - |
| (noun) a conservative advocate of capitalism | - |
| cardiologist | (noun) a specialist in cardiology; a specialist in the structure and function and disorders of the heart | Synonyms: heart specialist, heart surgeon |
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| careerist | (noun) a professional who is intent on furthering his or her career by any possible means and often at the expense of their own integrity | - |
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| caricaturist | (noun) someone who parodies in an exaggerated manner | - |
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| cartoonist | (noun) a person who draws cartoons | - |
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| casuist | (noun) someone whose reasoning is subtle and often specious | Synonyms: sophist |
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| catechist | (noun) one who instructs catechumens in preparation for baptism (especially one using a catechism) | - |
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| cellist | (noun) someone who plays a violoncello | Synonyms: violoncellist |
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| centralist | (adjective) advocating centralization | Synonyms: centralistic |
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| centrist | (adjective) supporting or pursuing a course of action that is neither liberal nor conservative | Synonyms: middle-of-the-road |
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| (noun) a person who takes a position in the political center | Synonyms: middle of the roader, moderate, moderationist |
| ceramicist | (noun) a craftsman who shapes pottery on a potter's wheel and bakes them in a kiln | Synonyms: ceramist, potter, thrower |
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| ceramist | (noun) a craftsman who shapes pottery on a potter's wheel and bakes them in a kiln | Synonyms: ceramicist, potter, thrower |
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| chartist | (noun) a stock market analyst who tries to predict market trends from graphs of recent prices of securities | Synonyms: technical analyst |
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| chauvinist | (noun) an extreme bellicose nationalist | Synonyms: flag-waver, hundred-percenter, jingo, jingoist, patrioteer |
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| (noun) a person with a prejudiced belief in the superiority of his or her own kind | - |
| checklist | (noun) a list of items (names or tasks etc.) to be checked or consulted | - |
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| chemist | (noun) a scientist who specializes in chemistry | - |
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| (noun) a health professional trained in the art of preparing and dispensing drugs | Synonyms: apothecary, druggist, pharmacist, pill pusher, pill roller |