| 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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| 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 |
| 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 |
| 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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| alliterator | (noun) a speaker or writer who makes use of alliteration | - |
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| amelioratory | (adjective) tending to ameliorate | Synonyms: ameliorating, ameliorative, meliorative |
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| arbitrator | (noun) someone chosen to judge and decide a disputed issue | Synonyms: arbiter, umpire |
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| aspirator | (noun) a pump that draws air or another gas through a liquid | - |
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| asseverator | (noun) someone who claims to speak the truth | Synonyms: affirmer, asserter, avower, declarer |
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| barrator | (noun) someone guilty of barratry | Synonyms: barrater |
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| cardiorespiratory | (adjective) of or pertaining to or affecting both the heart and the lungs and their functions | Synonyms: cardiopulmonary |
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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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| celebrator | (noun) a person who is celebrating | Synonyms: celebrant, celebrater |
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| celebratory | (adjective) used for celebrating | - |
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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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| ceratozamia | (noun) a small cycad of the genus Ceratozamia having a short scaly woody trunk and fernlike foliage and woody cones; Mexico | - |
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| coconspirator | (noun) a member of a conspiracy | Synonyms: conspirator, machinator, plotter |
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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 |
| conspirator | (noun) a member of a conspiracy | Synonyms: coconspirator, machinator, plotter |
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| conspiratorial | (adjective) relating to or characteristic of conspiracy or conspirators | Synonyms: conspirative |
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| cooperator | (noun) an associate in an activity or endeavor or sphere of common interest | Synonyms: collaborator, pardner, partner |
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| corroboratory | (adjective) serving to support or corroborate | Synonyms: collateral, confirmative, confirmatory, confirming, corroborative, substantiating, substantiative, validating, validatory, verificatory, verifying |
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| counterdemonstrator | (noun) someone who demonstrates in opposition to another demonstration | - |
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| craton | (noun) the part of a continent that is stable and forms the central mass of the continent; typically Precambrian | - |
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| curator | (noun) the custodian of a collection (as a museum or library) | Synonyms: conservator |
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| curatorial | (adjective) of or relating to a curator or the duties of a curator | - |
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| curatorship | (noun) the position of curator | - |
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| declaratory | (adjective) relating to the use of or having the nature of a declaration | Synonyms: asserting, declarative |
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| decorator | (noun) someone who decorates | Synonyms: ornamentalist |
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| (noun) a person who specializes in interior decoration | Synonyms: house decorator, interior decorator, room decorator |
| demonstrator | (noun) someone who participates in a public display of group feeling | Synonyms: protester |
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| (noun) someone who demonstrates an article to a prospective buyer | Synonyms: sales demonstrator |
| (noun) a teacher or teacher's assistant who demonstrates the principles that are being taught | - |
| denigratory | (adjective) (used of statements) harmful and often untrue; tending to discredit or malign | Synonyms: calumniatory, calumnious, defamatory, denigrating, denigrative, libellous, libelous, slanderous |
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| denitrator | (noun) Any device used to remove nitrates or other nitrogen compounds, especially from water. | - |
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| enumerator | (noun) someone who collects census data by visiting individual homes | Synonyms: census taker |
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| epikeratophakia | (noun) using a piece of donated corneal tissue to repair the eye of someone who has had a cataract removed | - |
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| expectorator | (noun) a medicine promoting expectoration | Synonyms: expectorant |
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| (noun) a person who spits (ejects saliva or phlegm from the mouth) | Synonyms: spitter |
| expiratory | (adjective) of or relating to the breathing out phase of respiration | - |
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| exploratory | (adjective) serving in or intended for exploration or discovery | Synonyms: explorative |
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| generator | (noun) engine that converts mechanical energy into electrical energy by electromagnetic induction | - |
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| (noun) an apparatus that produces a vapor or gas | - |
| (noun) an electronic device for producing a signal voltage | - |
| (noun) someone who originates or causes or initiates something | Synonyms: author, source |
| illustrator | (noun) an artist who makes illustrations (for books or magazines or advertisements etc.) | - |
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| inamorato | (noun) a man with whom you are in love or have an intimate relationship | - |
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| incinerator | (noun) a furnace for incinerating (especially to dispose of refuse) | - |
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| infiltrator | (noun) an intruder (as troops) with hostile intent | - |
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| (noun) someone who takes up a position surreptitiously for the purpose of espionage | - |
| inspiratory | (adjective) pertaining to the drawing in phase of respiration | - |
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| integrator | (noun) a measuring instrument for measuring the area of an irregular plane figure | Synonyms: planimeter |
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| invigorator | (noun) an agent that gives or restores life or vigor | Synonyms: enlivener, quickener |
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| keratoacanthoma | (noun) skin tumor that grows rapidly (especially in older people) and resembles a carcinoma but does not spread; it usually disappears spontaneously, often leaving a scar | - |
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| keratocele | (noun) hernia of the cornea | - |
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| keratoconjunctivitis | (noun) inflammation of the cornea and conjunctiva | - |
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| keratoconus | (noun) abnormal cone-shaped protrusion of the cornea of the eye; can be treated by epikeratophakia | - |
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| keratoderma | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratodermia |
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| keratodermia | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratoderma |
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| keratohyalin | (noun) hyaline in the large granules of the stratum granulosum | - |
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| keratoiritis | (noun) inflammation of the cornea and the iris of the eye | - |
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| keratomalacia | (noun) softening and drying and ulceration of the cornea resulting from vitamin A deficiency; symptom of cystic fibrosis or sprue | - |
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| keratomycosis | (noun) fungal infection of the cornea | - |
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| keratonosis | (noun) any abnormal condition of the outer skin (epidermis) | - |
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| keratonosus | (noun) any disease of the cornea | - |
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| keratoplasty | (noun) a surgical procedure in which part or all of a damaged or diseased cornea is replaced by healthy corneal tissue from a donor | Synonyms: corneal graft, corneal transplant |
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| keratoscleritis | (noun) inflammation of the cornea and sclera of the eye | - |
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| keratoscope | (noun) medical instrument to examine the cornea in order to detect irregularities in its anterior surface | - |
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| keratoscopy | (noun) examination of the cornea with a keratoscope to detect irregularities in its anterior surface | - |
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| keratosis | (noun) a skin condition marked by an overgrowth of layers of horny skin | - |
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| keratotomy | (noun) surgical incision into the cornea | - |
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| laboratory | (noun) a workplace for the conduct of scientific research | Synonyms: lab, research lab, research laboratory, science lab, science laboratory |
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| (noun) a region resembling a laboratory inasmuch as it offers opportunities for observation and practice and experimentation | Synonyms: testing ground |
| liberator | (noun) someone who releases people from captivity or bondage | - |
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| migrator | (noun) an animal (especially birds and fish) that travels between different habitats at particular times of the year | - |
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| (noun) traveler who moves from one region or country to another | Synonyms: migrant |
| migratory | (adjective) used of animals that move seasonally | - |
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| (adjective) habitually moving from place to place especially in search of seasonal work | Synonyms: migrant |
| moderato | (adjective) (of tempo) moderate | - |
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| moderator | (noun) someone who mediates disputes and attempts to avoid violence | - |
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| (noun) someone who presides over a forum or debate | - |
| (noun) in the Presbyterian church, the officer who presides over a synod or general assembly | - |
| (noun) any substance used to slow down neutrons in nuclear reactors | - |
| moderatorship | (noun) the position of moderator | - |
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| moratorium | (noun) suspension of an ongoing activity | - |
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| (noun) a legally authorized postponement before some obligation must be discharged | - |
| narrator | (noun) someone who tells a story | Synonyms: storyteller, teller |
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| nonexploratory | (adjective) not exploratory | Synonyms: nonexplorative, unexplorative, unexploratory |
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| nonmigratory | (adjective) used of animals that do not migrate | Synonyms: resident |
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| numerator | (noun) the dividend of a fraction | - |
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| obliterator | (noun) an eliminator that does away with all traces | - |
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| obturator | (noun) a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate) | - |
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| operator | (noun) an agent that operates some apparatus or machine | Synonyms: manipulator |
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| (noun) someone who owns or operates a business | - |
| (noun) a shrewd or unscrupulous person who knows how to circumvent difficulties | Synonyms: hustler, wheeler dealer |
| (noun) a speculator who trades aggressively on stock or commodity markets | - |
| (noun) (mathematics) a symbol or function representing a mathematical operation | - |
| orator | (noun) a person who delivers a speech or oration | Synonyms: public speaker, rhetorician, speechifier, speechmaker |
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| oratorical | (adjective) characteristic of an orator or oratory | - |
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| oratorio | (noun) a musical composition for voices and orchestra based on a religious text | Synonyms: cantata |
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| oratory | (noun) addressing an audience formally (usually a long and rhetorical address and often pompous) | - |
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| orchestrator | (noun) an arranger who writes for orchestras | - |
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| penetrator | (noun) an intruder who passes into or through (often by overcoming resistance) | - |
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| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
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| preparatory | (adjective) preceding and preparing for something | Synonyms: preparative, propaedeutic |
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| procurator | (noun) (ancient Rome) someone employed by the Roman Emperor to manage finance and taxes | - |
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| (noun) a person authorized to act for another | Synonyms: placeholder, proxy |
| protoceratops | (noun) small horned dinosaur | - |
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| refrigerator | (noun) white goods in which food can be stored at low temperatures | Synonyms: icebox |
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| remunerator | (noun) a person who pays money for something | Synonyms: payer |
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| respirator | (noun) a breathing device for administering long-term artificial respiration | Synonyms: inhalator |
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| (noun) a protective mask with a filter; protects the face and lungs against poisonous gases | Synonyms: gas helmet, gasmask |
| respiratory | (adjective) pertaining to respiration | - |
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| saratoga | (noun) a species of large fish found in Australian rivers, it has a red or pink spot on every scale (Scleropages leichardti) | Synonyms: Australian arowana, Dawson River salmon, Scleropages leichardti, spotted barramundi, spotted bonytongue |
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