| 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 |
| 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 |
| 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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| adjudicator | (noun) a person who studies and settles conflicts and disputes | - |
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| 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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| 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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| 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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| 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 | - |
| 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 | - |
| 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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| ambulatory | (noun) a covered walkway (as in a cloister) | - |
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| amputator | (noun) a surgeon who removes part or all of a limb | - |
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| anatomical | (noun) an expression that relates to anatomy | Synonyms: anatomical reference |
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| anatomist | (noun) an expert in anatomy | - |
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| 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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| 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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| anticipator | (noun) one who anticipates | Synonyms: anticipant |
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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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| appreciator | (noun) a person who is fully aware of something and understands it | - |
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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 | - |
| 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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| astrogator | (noun) the navigator of a spacecraft | - |
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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 |
| atomisation | (noun) separating something into fine particles | Synonyms: atomization, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomization |
| 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 | - |
| atomization | (noun) separating something into fine particles | Synonyms: atomisation, fragmentation |
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| (noun) annihilation by reducing something to atoms | Synonyms: atomisation |
| 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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| atonalism | (noun) the absence of a key; alternative to the diatonic system | Synonyms: atonality |
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| atonality | (noun) the absence of a key; alternative to the diatonic system | Synonyms: atonalism |
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| atonement | (noun) the act of atoning for sin or wrongdoing (especially appeasing a deity) | Synonyms: expiation, propitiation |
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| (noun) compensation for a wrong | Synonyms: expiation, satisfaction |
| atonia | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonicity, atony |
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| atonicity | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonia, atony |
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| atony | (noun) lack of normal muscular tension or tonus | Synonyms: amyotonia, atonia, atonicity |
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| atopognosia | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosis |
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| atopognosis | (noun) absence or loss of topognosia; inability to locate correctly a point of touch | Synonyms: atopognosia |
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| atopy | (noun) an allergic reaction that becomes apparent in a sensitized person only minutes after contact | Synonyms: atopic allergy, immediate allergy, type I allergic reaction |
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| atorvastatin | (noun) an oral drug (trade name Lipitor) that is effective in lowering triglycerides; potent in reducing LDL cholesterol because higher doses can be given | Synonyms: Lipitor |
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| 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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| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| automaton | (noun) a mechanism that can move automatically | Synonyms: golem, robot |
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| (noun) a machine that operates on its own without the need for human control | - |
| (noun) someone who acts or responds in a mechanical or apathetic way | Synonyms: zombi, zombie |
| aviator | (noun) someone who operates an aircraft | Synonyms: aeronaut, flier, flyer |
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| ayatollah | (noun) a high-ranking Shiite religious leader who is regarded as an authority on religious law and its interpretation and who has political power as well | - |
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| barrator | (noun) someone guilty of barratry | Synonyms: barrater |
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| baton | (noun) a thin tapered rod used by a conductor to lead an orchestra or choir | Synonyms: wand |
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| (noun) a hollow cylinder passed from runner to runner in a relay race | - |
| (noun) a hollow metal rod that is wielded or twirled by a drum major or drum majorette | - |
| (noun) a short staff carried by some officials to symbolize an office or an authority | - |
| (noun) a short stout club used primarily by policemen | Synonyms: billy, billy club, billystick, nightstick, truncheon |
| bioclimatology | (noun) the study of effects of climate on living organisms | - |
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| bronchodilator | (noun) a drug that relaxes and dilates the bronchial passageways and improves the passages of air into the lungs | - |
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| calculator | (noun) a small machine that is used for mathematical calculations; can be mechanical or electronic | Synonyms: calculating machine |
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| (noun) an expert at calculation (or at operating calculating machines) | Synonyms: computer, estimator, figurer, reckoner |
| calorisator | (noun) an apparatus used in beet-sugar factories to heat the juice in order to aid the diffusion. | Synonyms: calorizator |
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| calorizator | (noun) an apparatus used in beet-sugar factories to heat the juice in order to aid the diffusion. | Synonyms: calorisator |
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| carbonator | (noun) a device that carries out carbonation. | Synonyms: soda carbonator, soda maker |
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| castrato | (noun) a male singer who was castrated before puberty and retains a soprano or alto voice | - |
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| catatonia | (noun) a form of schizophrenia characterized by a tendency to remain in a fixed stuporous state for long periods; the catatonia may give way to short periods of extreme excitement | Synonyms: catatonic schizophrenia, catatonic type schizophrenia |
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| (noun) extreme tonus; muscular rigidity; a common symptom in catatonic schizophrenia | - |
| catoptrics | (noun) branch of optics dealing with formation of images by mirrors | - |
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| catostomid | (noun) a cypriniform fish of the family Catostomidae | - |
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| celebrator | (noun) a person who is celebrating | Synonyms: celebrant, celebrater |
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| cephalhematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalohematoma |
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| cephalohematoma | (noun) a collection of blood under the scalp of a newborn; caused by pressure during birth | Synonyms: cephalhematoma |
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| ceratodus | (noun) extinct lungfish | - |
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| ceratopsian | (noun) any of several four-footed herbivorous dinosaurs with enormous beaked skulls; of the late Cretaceous in North America and Mongolia | Synonyms: horned dinosaur |
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| ceratosaur | (noun) primitive medium-sized theropod; swift-running bipedal carnivorous dinosaur having grasping hands with sharp claws and a short horn between the nostrils; Jurassic in North America | Synonyms: ceratosaurus |
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| ceratosaurus | (noun) primitive medium-sized theropod; swift-running bipedal carnivorous dinosaur having grasping hands with sharp claws and a short horn between the nostrils; Jurassic in North America | Synonyms: ceratosaur |
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