| abator | (noun) a person who abates a nuisance | - |
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| abbreviator | (noun) one who shortens or abridges or condenses a written work | Synonyms: abridger |
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| abdicator | (noun) one who formally relinquishes an office or responsibility | - |
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| abnegator | (noun) one who gives up or relinquishes or renounces something | - |
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| abominator | (noun) one who hates or loathes | Synonyms: loather |
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| abrogator | (noun) an authority or official empowered to abolish or annul or repeal | - |
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| accelerator | (noun) a valve that regulates the supply of fuel to the engine | Synonyms: throttle, throttle valve |
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| (noun) a scientific instrument that increases the kinetic energy of charged particles | Synonyms: atom smasher, particle accelerator |
| (noun) a pedal that controls the throttle valve | Synonyms: accelerator pedal, gas, gas pedal, gun, throttle |
| (noun) (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected | Synonyms: catalyst |
| acceleratory | (adjective) tending to increase velocity | Synonyms: accelerative |
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| accommodator | (noun) someone who performs a service or does a favor | Synonyms: obliger |
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| accumulator | (noun) a voltaic battery that stores electric charge | Synonyms: storage battery |
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| (noun) (computer science) a register that has a built-in adder that adds an input number to the contents of the register | Synonyms: accumulator register |
| (noun) a person who is employed to collect payments (as for rent or taxes) | Synonyms: collector, gatherer |
| accusatorial | (adjective) specifically indicating a form of prosecution in which one is publicly accused of and tried for a crime and in which the judge is not also the prosecutor | - |
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| accusatory | (adjective) containing or expressing accusation | Synonyms: accusative, accusing, accusive |
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| achromatous | (adjective) having little or inadequate color | - |
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| activator | (noun) (biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription | - |
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| actuator | (noun) a mechanism that puts something into automatic action | - |
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| adenocarcinomatous | (adjective) of or pertaining to adenocarcinoma | - |
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| adjudicator | (noun) a person who studies and settles conflicts and disputes | - |
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| adjudicatory | (adjective) concerned with adjudicating | Synonyms: adjudicative |
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| adjuratory | (adjective) earnestly or solemnly entreating | - |
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| (adjective) containing a solemn charge or command | - |
| administrator | (noun) someone who administers a business | Synonyms: decision maker |
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| (noun) the party appointed by a probate court to distribute the estate of someone who dies without a will or without naming an executor | - |
| (noun) someone who manages a government agency or department | Synonyms: executive |
| adulator | (noun) a person who uses flattery | Synonyms: flatterer |
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| adulatory | (adjective) obsequiously complimentary | Synonyms: flattering |
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| adulterator | (noun) a changer who lessens the purity or effectiveness of a substance | - |
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| (noun) any substance that lessens the purity or effectiveness of a substance | Synonyms: adulterant |
| advocator | (noun) a person who pleads for a cause or propounds an idea | Synonyms: advocate, exponent, proponent |
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| aerator | (noun) an apparatus for exposing something to the air (as sewage) | - |
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| aerogenerator | (noun) generator that extracts usable energy from winds | Synonyms: wind generator, windmill |
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| affirmatory | (adjective) affirming or giving assent | Synonyms: affirmative |
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| aflatoxin | (noun) a potent carcinogen from the fungus Aspergillus; can be produced and stored for use as a bioweapon | - |
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| agglomerator | (noun) a device that causes material to gather into rounded balls | - |
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| aggravator | (noun) an unpleasant person who is annoying or exasperating | Synonyms: annoyance |
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| aggregator | (noun) a person who collects things | Synonyms: collector |
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| agitator | (noun) one who agitates; a political troublemaker | Synonyms: fomenter |
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| aleatory | (adjective) dependent on chance | - |
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| alienator | (noun) an unpleasant person who causes friendly people to become indifferent or unfriendly or hostile | - |
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| alleviator | (noun) remedy that alleviates pain without curing | Synonyms: alleviant, palliative |
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| (noun) a therapist who makes suffering more endurable | - |
| alleviatory | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviative, lenitive, mitigative, mitigatory, palliative |
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| alligator | (noun) either of two amphibious reptiles related to crocodiles but with shorter broader snouts | Synonyms: gator |
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| (noun) leather made from alligator's hide | - |
| (verb) crack and acquire the appearance of alligator hide, as from weathering or improper application; of paint and varnishes | - |
| alligatored | (adjective) of paint or varnish; having the appearance of alligator hide | Synonyms: cracked |
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| alligatorfish | (noun) small very elongate sea poachers | Synonyms: Aspidophoroides monopterygius |
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| alliterator | (noun) a speaker or writer who makes use of alliteration | - |
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| allocator | (noun) a person with authority to allot or deal out or apportion | Synonyms: distributor |
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| alternator | (noun) an old term for an electric generator that produces alternating current (especially in automobiles) | - |
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| amalgamator | (noun) a businessman who arranges an amalgamation of two or more commercial companies | - |
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| amatory | (adjective) expressive of or exciting sexual love or romance | Synonyms: amorous, romantic |
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| ambulatory | (adjective) relating to or adapted for walking | - |
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| (adjective) able to walk about | Synonyms: ambulant |
| (noun) a covered walkway (as in a cloister) | - |
| amelioratory | (adjective) tending to ameliorate | Synonyms: ameliorating, ameliorative, meliorative |
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| amendatory | (adjective) effecting amendment | - |
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| amputator | (noun) a surgeon who removes part or all of a limb | - |
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| anatomic | (adjective) of or relating to the structure of the body | Synonyms: anatomical |
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| (adjective) of or relating to the branch of morphology that studies the structure of organisms | Synonyms: anatomical |
| anatomical | (adjective) of or relating to the structure of the body | Synonyms: anatomic |
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| (adjective) of or relating to the branch of morphology that studies the structure of organisms | Synonyms: anatomic |
| (noun) an expression that relates to anatomy | Synonyms: anatomical reference |
| anatomically | (adverb) with respect to anatomy | - |
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| anatomise | (verb) dissect in order to analyze | Synonyms: anatomize |
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| anatomist | (noun) an expert in anatomy | - |
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| anatomize | (verb) analyze down to the smallest detail | - |
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| (verb) dissect in order to analyze | Synonyms: anatomise |
| anatomy | (noun) a detailed analysis | - |
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| (noun) alternative names for the body of a human being | Synonyms: bod, build, chassis, figure, flesh, form, frame, human body, material body, physical body, physique, shape, soma |
| (noun) the branch of morphology that deals with the structure of animals | Synonyms: general anatomy |
| anatotitan | (noun) one of the largest and most famous duck-billed dinosaurs | - |
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| anatoxin | (noun) a bacterial toxin that has been weakened until it is no longer toxic but is strong enough to induce the formation of antibodies and immunity to the specific disease caused by the toxin | Synonyms: toxoid |
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| angiomatous | (adjective) of or related to or having a tumor of the kind known as an angioma | - |
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| animator | (noun) the technician who produces animated cartoons | - |
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| (noun) someone who imparts energy and vitality and spirit to other people | Synonyms: energiser, energizer, vitaliser, vitalizer |
| annihilator | (noun) a total destroyer | - |
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| annotator | (noun) a commentator who writes notes to a text | - |
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| annunciator | (noun) an indicator that announces which electrical circuit has been active (as on a telephone switchboard) | - |
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| annunciatory | (adjective) relating to the act of announcing or being announced | - |
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| anticipator | (noun) one who anticipates | Synonyms: anticipant |
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| anticipatory | (adjective) in anticipation | Synonyms: prevenient |
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| apatosaur | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaurus, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| apatosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| applicator | (noun) a device for applying a substance | Synonyms: applier |
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| applicatory | (adjective) readily applicable or practical | Synonyms: applicative |
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| appreciator | (noun) a person who is fully aware of something and understands it | - |
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| approbatory | (adjective) expressing or manifesting praise or approval | Synonyms: affirmative, approbative, approving, plausive |
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| appropriator | (noun) someone who takes for his or her own use (especially without permission) | - |
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| arbitrator | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbiter, umpire |
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| arrogator | (noun) a person who through conceit makes pretentious claims to rights or advantages that he or she is not entitled to or to qualities that he or she does not possess | - |
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| articulator | (noun) a movable speech organ | - |
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| (noun) someone who pronounces words | - |
| articulatory | (adjective) of or relating to articulation | Synonyms: articulative |
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| asphyxiator | (noun) a manually operated device for extinguishing small fires | Synonyms: extinguisher, fire extinguisher |
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| aspirator | (noun) a pump that draws air or another gas through a liquid | - |
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| assassinator | (noun) a murderer (especially one who kills a prominent political figure) who kills by a surprise attack and often is hired to do the deed | Synonyms: assassin, bravo |
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| asseverator | (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, avower, declarer |
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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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| assimilatory | (adjective) capable of taking (gas, light, or liquids) into a solution | Synonyms: assimilating, assimilative |
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| associatory | (adjective) characterized by or causing or resulting from the process of bringing ideas or events together in memory or imagination | Synonyms: associative |
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| astomatous | (adjective) having no mouth or mouthlike opening | Synonyms: mouthless |
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| astrogator | (noun) the navigator of a spacecraft | - |
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| atheromatous | (adjective) of or relating to or resembling atheroma | Synonyms: atheromatic |
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| atole | (noun) eaten as mush or as a thin gruel | - |
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| atoll | (noun) an island consisting of a circular coral reef surrounding a lagoon | - |
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| atom | (noun) (physics and chemistry) the smallest component of an element having the chemical properties of the element | - |
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| (noun) (nontechnical usage) a tiny piece of anything | Synonyms: corpuscle, molecule, mote, particle, speck |
| atomic | (adjective) (weapons) deriving destructive energy from the release of atomic energy | Synonyms: nuclear |
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| (adjective) of or relating to or comprising atoms | - |
| (adjective) immeasurably small | - |
| atomisation | (noun) separating something into fine particles | Synonyms: atomization, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomization |
| atomise | (verb) break up into small particles | Synonyms: atomize |
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| (verb) strike at with firepower or bombs | Synonyms: atomize, nuke, zap |
| (verb) spray very finely | Synonyms: atomize |
| 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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| atomism | (noun) (chemistry) any theory in which all matter is composed of tiny discrete finite indivisible indestructible particles | Synonyms: atomic theory, atomist theory, atomistic theory |
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| (noun) (psychology) a theory that reduces all mental phenomena to simple elements (sensations and feelings) that form complex ideas by association | - |
| atomistic | (adjective) divided into separate and often disparate elements | Synonyms: atomistical |
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| atomistical | (adjective) divided into separate and often disparate elements | Synonyms: atomistic |
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| atomization | (noun) separating something into fine particles | Synonyms: atomisation, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomisation |
| atomize | (verb) break up into small particles | Synonyms: atomise |
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| (verb) strike at with firepower or bombs | Synonyms: atomise, nuke, zap |
| (verb) spray very finely | Synonyms: atomise |
| 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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| atonal | (adjective) characterized by avoidance of traditional western tonality | Synonyms: unkeyed |
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