| elevator | (noun) lifting device consisting of a platform or cage that is raised and lowered mechanically in a vertical shaft in order to move people from one floor to another in a building | Synonyms: lift |
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| (noun) the airfoil on the tailplane of an aircraft that makes it ascend or descend | - |
| eliminator | (noun) an agent that eliminates something | - |
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| emancipator | (noun) someone who frees others from bondage | Synonyms: manumitter |
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| emulator | (noun) someone who copies the words or behavior of another | Synonyms: ape, aper, copycat, imitator |
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| enumerator | (noun) someone who collects census data by visiting individual homes | Synonyms: census taker |
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| epilator | (noun) a cosmetic for temporary removal of undesired hair | Synonyms: depilator, depilatory |
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| equator | (noun) an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles | - |
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| (noun) a circle dividing a sphere or other surface into two usually equal and symmetrical parts | - |
| equivocator | (noun) a respondent who avoids giving a clear direct answer | Synonyms: hedger, tergiversator |
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| eradicator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: exterminator, terminator |
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| escalator | (noun) a stairway whose steps move continuously on a circulating belt | Synonyms: moving staircase, moving stairway |
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| (noun) a clause in a contract that provides for an increase or a decrease in wages or prices or benefits etc. depending on certain conditions (as a change in the cost of living index) | Synonyms: escalator clause |
| estimator | (noun) an expert at calculation (or at operating calculating machines) | Synonyms: calculator, computer, figurer, reckoner |
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| evaluator | (noun) an authority who is able to estimate worth or quality | Synonyms: judge |
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| excavator | (noun) a machine for excavating | Synonyms: digger, power shovel, shovel |
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| (noun) a workman who excavates for foundations of buildings or for quarrying | - |
| excogitator | (noun) a thinker who considers carefully and thoroughly | - |
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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 |
| expurgator | (noun) a person who edits a text by removing obscene or offensive words or passages | Synonyms: bowdleriser, bowdlerizer |
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| exterminator | (noun) someone who exterminates (especially someone whose occupation is the extermination of troublesome rodents and insects) | Synonyms: eradicator, terminator |
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| extirpator | (noun) a farm implement used to remove weeds. | - |
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| fabricator | (noun) someone who tells lies | Synonyms: fibber, storyteller |
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| facilitator | (noun) someone who makes progress easier | - |
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| flocculator | (noun) An apparatus used in the process of flocculation. | - |
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| fornicator | (noun) someone who commits adultery or fornication | Synonyms: adulterer |
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| fryolator | (noun) A kitchen appliance for deep frying; its size depends on intended use. | Synonyms: deep fat fryer, deep fryer, frier, fryer |
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| fumigator | (noun) a device that generates a gas for the purpose of disinfecting or eradicating pests | - |
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| (noun) someone whose job is to fumigate | - |
| gator | (noun) either of two amphibious reptiles related to crocodiles but with shorter broader snouts | Synonyms: alligator |
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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 |
| gladiator | (noun) (ancient Rome) a professional combatant or a captive who entertained the public by engaging in mortal combat | - |
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| (noun) a professional boxer | Synonyms: prizefighter |
| granulator | (noun) a machine that forms material (such as plastics, bottles, organics, etc.) into granules. | Synonyms: granulator machine |
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| hesitator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, vacillator, waverer |
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| illustrator | (noun) an artist who makes illustrations (for books or magazines or advertisements etc.) | - |
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| imitator | (noun) someone who copies the words or behavior of another | Synonyms: ape, aper, copycat, emulator |
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| (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: impersonator |
| impersonator | (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: imitator |
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| incinerator | (noun) a furnace for incinerating (especially to dispose of refuse) | - |
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| incubator | (noun) apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used for chicks or premature infants | Synonyms: brooder |
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| indicator | (noun) a device for showing the operating condition of some system | - |
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| (noun) a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time | Synonyms: index, index number, indicant |
| (noun) a signal for attracting attention | - |
| (noun) (chemistry) a substance that changes color to indicate the presence of some ion or substance; can be used to indicate the completion of a chemical reaction or (in medicine) to test for a particular reaction | - |
| 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 | - |
| inflator | (noun) an air pump operated by hand to inflate something (as a tire) | Synonyms: inflater |
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| inhalator | (noun) a dispenser that produces a chemical vapor to be inhaled in order to relieve nasal congestion | Synonyms: inhaler |
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| (noun) a breathing device for administering long-term artificial respiration | Synonyms: respirator |
| initiator | (noun) a person who initiates a course of action | Synonyms: instigator |
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| innovator | (noun) someone who helps to open up a new line of research or technology or art | Synonyms: groundbreaker, pioneer, trailblazer |
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| inoculator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: vaccinator |
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| instigator | (noun) a person who initiates a course of action | Synonyms: initiator |
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| (noun) someone who deliberately foments trouble | Synonyms: firebrand, inciter, instigant, provoker |
| instillator | (noun) medical apparatus that puts a liquid into a cavity drop by drop | - |
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| insulator | (noun) a material such as glass or porcelain with negligible electrical or thermal conductivity | Synonyms: dielectric, nonconductor |
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| integrator | (noun) a measuring instrument for measuring the area of an irregular plane figure | Synonyms: planimeter |
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| intermediator | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediary, mediator |
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| interrogator | (noun) a questioner who is excessively harsh | Synonyms: inquisitor |
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| invalidator | (noun) an official who can invalidate or nullify | Synonyms: nullifier, voider |
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| investigator | (noun) someone who investigates | - |
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| (noun) a scientist who devotes himself to doing research | Synonyms: research worker, researcher |
| (noun) a police officer who investigates crimes | Synonyms: detective, police detective, tec |
| invigilator | (noun) someone who watches examination candidates to prevent cheating | - |
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| invigorator | (noun) an agent that gives or restores life or vigor | Synonyms: enlivener, quickener |
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| lachrymator | (noun) a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds | Synonyms: lacrimator, tear gas, teargas |
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| lacrimator | (noun) a gas that makes the eyes fill with tears but does not damage them; used in dispersing crowds | Synonyms: lachrymator, tear gas, teargas |
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| laminator | (noun) Any of a range of machines used for lamination. | Synonyms: laminating machine |
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| (noun) a person who makes laminates (especially plastic laminates) | - |
| lapidator | (noun) an attacker who pelts the victim with stones (especially with intent to kill) | Synonyms: stoner |
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| laudator | (noun) someone who communicates high praise | Synonyms: extoller, lauder |
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| legislator | (noun) someone who makes or enacts laws | - |
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| levator | (noun) a muscle that serves to lift some body part (as the eyelid or lip) | - |
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| liberator | (noun) someone who releases people from captivity or bondage | - |
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| liquidator | (noun) (law) a person (usually appointed by a court of law) who liquidates assets or preserves them for the benefit of affected parties | Synonyms: receiver |
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| (noun) a criminal who commits homicide (who performs the unlawful premeditated killing of another human being) | Synonyms: manslayer, murderer |
| litigator | (noun) (law) a party to a lawsuit; someone involved in litigation | Synonyms: litigant |
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| locator | (noun) a person who fixes the boundaries of land claims | Synonyms: locater |
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| lubricator | (noun) a substance capable of reducing friction by making surfaces smooth or slippery | Synonyms: lube, lubricant, lubricating substance |
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| machinator | (noun) a member of a conspiracy | Synonyms: coconspirator, conspirator, plotter |
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| mandator | (noun) an authority who issues a mandate | - |
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| manipulator | (noun) an agent that operates some apparatus or machine | Synonyms: operator |
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| (noun) a person who handles things manually | - |
| masturbator | (noun) a person who practices masturbation | Synonyms: onanist |
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| mediator | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediary, intermediator |
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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 |
| minicalculator | (noun) (old-fashioned) a very small handheld calculator. | - |
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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 | - |
| motivator | (noun) a positive motivational influence | Synonyms: incentive, inducement |
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| mutilator | (noun) a person who mutilates or destroys or disfigures or cripples | Synonyms: maimer, mangler |
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| narrator | (noun) someone who tells a story | Synonyms: storyteller, teller |
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| natator | (noun) a person who travels through the water by swimming | Synonyms: bather, swimmer |
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| navigator | (noun) in earlier times, a person who explored by ship | - |
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| (noun) the member of an aircrew who is responsible for the aircraft's course | - |
| (noun) the ship's officer in charge of navigation | Synonyms: sailing master |
| negotiator | (noun) someone who negotiates (confers with others in order to reach a settlement) | Synonyms: negotiant, treater |
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| nominator | (noun) someone who proposes a candidate for appointment or election | - |
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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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| orchestrator | (noun) an arranger who writes for orchestras | - |
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| originator | (noun) someone who creates new things | Synonyms: conceiver, mastermind |
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| oscillator | (noun) generator that produces sonic oscillations or alternating current | - |
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| osculator | (noun) someone who kisses | Synonyms: kisser |
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| peculator | (noun) someone who violates a trust by taking (money) for his own use | Synonyms: defalcator, embezzler |
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| penetrator | (noun) an intruder who passes into or through (often by overcoming resistance) | - |
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| perambulator | (noun) a small vehicle with four wheels in which a baby or child is pushed around | Synonyms: baby buggy, baby carriage, carriage, go-cart, pram, pushchair, pusher, stroller |
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| percolator | (noun) a coffeepot in which boiling water ascends through a central tube and filters back down through a basket of ground coffee beans | - |
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| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
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| photocoagulator | (noun) surgical instrument containing a laser for use in photocoagulation | - |
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| pollinator | (noun) an insect that carries pollen from one flower to another | - |
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| postulator | (noun) someone who assumes or takes something for granted as the basis of an argument | - |
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| (noun) (Roman Catholic Church) someone who proposes or pleads for a candidate for beatification or canonization | - |
| precipitator | (noun) removes dust particles from gases by electrostatic precipitation | Synonyms: Cottrell precipitator, electrostatic precipitator |
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| predator | (noun) any animal that lives by preying on other animals | Synonyms: predatory animal |
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| (noun) someone who attacks in search of booty | Synonyms: marauder, piranha, vulture |
| predicator | (noun) an expression that predicates | - |
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| prestidigitator | (noun) someone who performs magic tricks to amuse an audience | Synonyms: conjurer, conjuror, illusionist, magician |
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| prevaricator | (noun) a person who has lied or who lies repeatedly | Synonyms: liar |
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