| 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 | (noun) one who advocates absolutism | - |
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| abstractionist | (noun) a painter of abstract pictures | Synonyms: abstract artist |
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| 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 | (noun) a militant reformer | Synonyms: militant |
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| 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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| airburst | (noun) an explosion in the atmosphere | - |
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| airpost | (noun) a system of conveying mail by aircraft | Synonyms: airmail |
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| alarmist | (noun) a person who alarms others needlessly | - |
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| alcahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alkahest, universal solvent |
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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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| alecost | (noun) tansy-scented Eurasian perennial herb with buttonlike yellow flowers; used as potherb or salad green and sometimes for potpourri or tea or flavoring; sometimes placed in genus Chrysanthemum | Synonyms: balsam herb, bible leaf, Chrysanthemum balsamita, costmary, mint geranium, Tanacetum balsamita |
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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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| alkahest | (noun) hypothetical universal solvent once sought by alchemists | Synonyms: alcahest, universal solvent |
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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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| ameloblast | (noun) a cell from which tooth enamel develops | - |
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| amethyst | (noun) a transparent purple variety of quartz; used as a gemstone | - |
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| aminoplast | (noun) a plastic (synthetic resin) made from amino compounds; used as an adhesive and as a coating for paper and textiles | Synonyms: amino plastic, amino resin |
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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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| anagnost | (noun) a cleric in the minor orders of the Eastern Orthodox Church who reads the lessons aloud in the liturgy (analogous to the lector in the Roman Catholic Church) | - |
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| analogist | (noun) someone who looks for analogies or who reasons by analogy | - |
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| analyst | (noun) someone who is skilled at analyzing data | - |
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| (noun) a licensed practitioner of psychoanalysis | Synonyms: psychoanalyst |
| (noun) an expert who studies financial data (on credit or securities or sales or financial patterns etc.) and recommends appropriate business actions | - |
| anapaest | (noun) a metrical unit with unstressed-unstressed-stressed syllables | Synonyms: anapest |
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| anapest | (noun) a metrical unit with unstressed-unstressed-stressed syllables | Synonyms: anapaest |
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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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| angst | (noun) an acute but unspecific feeling of anxiety; usually reserved for philosophical anxiety about the world or about personal freedom | - |
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| animist | (noun) one who accepts the doctrine of animism | - |
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| 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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| anticatalyst | (noun) (chemistry) a substance that retards a chemical reaction or diminishes the activity of a catalyst | - |
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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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| arbalest | (noun) late version of the crossbow with a steel bow | Synonyms: arbalist |
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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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| archpriest | (noun) a senior clergyman and dignitary | Synonyms: hierarch, high priest, prelate, primate |
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| arianist | (noun) an adherent of Arianism (the belief that Jesus Christ was not truly God) | - |
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| armrest | (noun) a support for the arm | - |
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| arrest | (noun) the act of apprehending (especially apprehending a criminal) | Synonyms: apprehension, catch, collar, pinch, taking into custody |
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| (noun) the state of inactivity following an interruption | Synonyms: check, halt, hitch, stay, stop, stoppage |
| 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 |
| 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 | (noun) someone who does not believe in the existence of a god | - |
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| automobilist | (noun) someone who drives (or travels in) an automobile | Synonyms: motorist |
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| backblast | (noun) backfire from a recoilless weapon | Synonyms: back-blast |
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| backrest | (noun) a support that you can lean against while sitting | Synonyms: back |
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| bacteriologist | (noun) a biologist who studies bacteria | - |
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| ballast | (noun) any heavy material used to stabilize a ship or airship | - |
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| (noun) an electrical device for starting and regulating fluorescent and discharge lamps | Synonyms: light ballast |
| (noun) a resistor inserted into a circuit to compensate for changes (as those arising from temperature fluctuations) | Synonyms: ballast resistor, barretter |
| (noun) an attribute that tends to give stability in character and morals; something that steadies the mind or feelings | - |
| (noun) coarse gravel laid to form a bed for streets and railroads | - |
| 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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| bast | (noun) (botany) tissue that conducts synthesized food substances (e.g., from leaves) to parts where needed; consists primarily of sieve tubes | Synonyms: phloem |
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| (noun) strong woody fibers obtained especially from the phloem of from various plants | Synonyms: bast fiber |
| beanfeast | (noun) an annual dinner party given by an employer for the employees | - |
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| beast | (noun) a living organism characterized by voluntary movement | Synonyms: animal, animate being, brute, creature, fauna |
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| (noun) a cruelly rapacious person | Synonyms: brute, savage, wildcat, wolf |
| bedpost | (noun) any of 4 vertical supports at the corners of a bedstead | - |
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| bedrest | (noun) confinement to bed continuously (as in the case of some sick or injured persons) | Synonyms: bed rest |
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| behaviorist | (noun) a psychologist who subscribes to behaviorism | Synonyms: behaviourist |
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| behaviourist | (noun) a psychologist who subscribes to behaviorism | Synonyms: behaviorist |
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| behest | (noun) an authoritative command or request | - |
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| bequest | (noun) (law) a gift of personal property by will | Synonyms: legacy |
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| best | (noun) the supreme effort one can make | - |
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| (noun) the person who is most outstanding or excellent; someone who tops all others | Synonyms: topper |
| 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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