| 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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| abductor | (noun) a muscle that draws a body part away from the median line | Synonyms: abductor muscle |
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| (noun) someone who unlawfully seizes and detains a victim (usually for ransom) | Synonyms: kidnaper, kidnapper, snatcher |
| abettor | (noun) one who helps or encourages or incites another | Synonyms: abetter |
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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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| abstractor | (noun) one who makes abstracts or summarizes information | Synonyms: abstracter |
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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 |
| accentor | (noun) small sparrow-like songbird of mountainous regions of Eurasia | - |
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| acceptor | (noun) the person (or institution) who accepts a check or draft and becomes responsible for paying the party named in the draft when it matures | - |
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| (noun) (chemistry) in the formation of a coordinate bond it is the compound to which electrons are donated | - |
| 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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| actor | (noun) a theatrical performer | Synonyms: histrion, player, role player, thespian |
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| (noun) a person who acts and gets things done | Synonyms: doer, worker |
| actuator | (noun) a mechanism that puts something into automatic action | - |
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| adaptor | (noun) device that enables something to be used in a way different from that for which it was intended or makes different pieces of apparatus compatible | Synonyms: adapter |
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| adductor | (noun) a muscle that draws a body part toward the median line | Synonyms: adductor muscle |
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| adjudicator | (noun) a person who studies and settles conflicts and disputes | - |
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| adjustor | (noun) one who investigates insurance claims or claims for damages and recommends an effective settlement | Synonyms: adjuster, claim agent, claims adjuster, claims adjustor |
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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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| 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 | - |
| (verb) crack and acquire the appearance of alligator hide, as from weathering or improper application; of paint and varnishes | - |
| 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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| amboceptor | (noun) an immune body formed in the blood during infection or immunization that serves to link the complement to the antigen. | - |
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| amputator | (noun) a surgeon who removes part or all of a limb | - |
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| ancestor | (noun) someone from whom you are descended (but usually more remote than a grandparent) | Synonyms: antecedent, ascendant, ascendent, root |
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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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| 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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| 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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| 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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| 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 |
| 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 | - |
| authenticator | (noun) one who determines authenticity (as of works of art) or who guarantees validity | Synonyms: appraiser |
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| autoinjector | (noun) a hypodermic syringe to use in injecting yourself with a liquid | - |
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| aviator | (noun) someone who operates an aircraft | Synonyms: aeronaut, flier, flyer |
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| baroreceptor | (noun) a sensory receptor that responds to pressure | - |
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| barrator | (noun) someone guilty of barratry | Synonyms: barrater |
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| benefactor | (noun) a person who helps people or institutions (especially with financial help) | Synonyms: helper |
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| bettor | (noun) someone who bets | Synonyms: better, punter, wagerer |
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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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| cantor | (noun) the official of a synagogue who conducts the liturgical part of the service and sings or chants the prayers intended to be performed as solos | Synonyms: hazan |
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| (noun) the musical director of a choir | Synonyms: choirmaster, precentor |
| capacitor | (noun) an electrical device characterized by its capacity to store an electric charge | Synonyms: capacitance, condenser, electrical condenser |
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| captor | (noun) a person who captures and holds people or animals | Synonyms: capturer |
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| carbonator | (noun) a device that carries out carbonation. | Synonyms: soda carbonator, soda maker |
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| carburetor | (noun) mixes air with gasoline vapor prior to explosion | Synonyms: carburettor |
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| carburettor | (noun) mixes air with gasoline vapor prior to explosion | Synonyms: carburetor |
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| castor | (noun) a hat made with the fur of a beaver (or similar material) | Synonyms: beaver |
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| (noun) a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable | Synonyms: caster |
| (noun) a shaker with a perforated top for sprinkling powdered sugar | Synonyms: caster |
| celebrator | (noun) a person who is celebrating | Synonyms: celebrant, celebrater |
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| chemoreceptor | (noun) a sensory receptor that responds to chemical stimuli | - |
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| chiropractor | (noun) a therapist who practices chiropractic | - |
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| coadjutor | (noun) an assistant to a bishop | - |
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| coagulator | (noun) an agent that produces coagulation | Synonyms: coagulant |
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| coconspirator | (noun) a member of a conspiracy | Synonyms: conspirator, machinator, plotter |
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| cofactor | (noun) a substance (as a coenzyme) that must join with another to produce a given result | - |
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| collaborator | (noun) an associate in an activity or endeavor or sphere of common interest | Synonyms: cooperator, pardner, partner |
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| (noun) someone who collaborates with an enemy occupying force | Synonyms: collaborationist, quisling |
| (noun) someone who assists in a plot | Synonyms: confederate, henchman, partner in crime |
| collator | (noun) a machine that selects, merges and matches decks of punch cards. | - |
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| collector | (noun) the electrode in a transistor through which a primary flow of carriers leaves the region between the electrodes | - |
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| (noun) a crater that has collected cosmic material hitting the earth | - |
| (noun) a person who is employed to collect payments (as for rent or taxes) | Synonyms: accumulator, gatherer |
| (noun) a person who collects things | Synonyms: aggregator |
| collimator | (noun) optical device consisting of a tube containing a convex achromatic lens at one end and a slit at the other with the slit at the focus of the lens; light rays leave the slit as a parallel beam | - |
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| (noun) a small telescope attached to a large telescope to use in setting the line of the larger one | - |
| commentator | (noun) a writer who reports and analyzes events of the day | Synonyms: reviewer |
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| (noun) an expert who observes and comments on something | Synonyms: observer |
| communicator | (noun) a person who communicates with others | - |
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| commutator | (noun) switch for reversing the direction of an electric current | - |
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| competitor | (noun) the contestant you hope to defeat | Synonyms: challenger, competition, contender, rival |
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| compositor | (noun) one who sets written material into type | Synonyms: setter, typesetter, typographer |
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| conciliator | (noun) someone who tries to bring peace | Synonyms: make-peace, pacifier, peacemaker, reconciler |
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| conductor | (noun) a device designed to transmit electricity, heat, etc. | - |
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| (noun) the person who leads a musical group | Synonyms: director, music director |
| (noun) the person who collects fares on a public conveyance | - |
| (noun) a substance that readily conducts e.g. electricity and heat | - |
| congenator | (noun) an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus) | Synonyms: congener, congeneric, relative |
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