| facilitator | (noun) someone who makes progress easier | - |
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| facilitatory | (adjective) inducing or aiding in facilitating neural activity | - |
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| feudatory | (adjective) of or pertaining to the relation of a feudal vassal to his lord | - |
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| (adjective) owing feudal allegiance to or being subject to a sovereign | - |
| (noun) a person holding a fief; a person who owes allegiance and service to a feudal lord | Synonyms: liege, liege subject, liegeman, vassal |
| 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 |
| gladiatorial | (adjective) of or relating to or resembling gladiators or their combat | - |
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| gradatory | (adjective) taking place by degrees | Synonyms: gradational, graduated |
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| granulator | (noun) a machine that forms material (such as plastics, bottles, organics, etc.) into granules. | Synonyms: granulator machine |
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| gratulatory | (adjective) expressive of sympathetic pleasure or joy on account of someone's success or good fortune | Synonyms: congratulatory |
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| gubernatorial | (adjective) relating to a governor | - |
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| gustatorial | (adjective) of or relating to gustation | Synonyms: gustative, gustatory |
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| gustatory | (adjective) of or relating to gustation | Synonyms: gustative, gustatorial |
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| hallucinatory | (adjective) characterized by or characteristic of hallucination | - |
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| hesitator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, vacillator, waverer |
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| hortatory | (adjective) giving strong encouragement | Synonyms: exhortative, exhortatory, hortative |
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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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| incriminatory | (adjective) charging or suggestive of guilt or blame | Synonyms: criminative, criminatory, incriminating |
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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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| inculpatory | (adjective) causing blame to be imputed to | Synonyms: inculpative |
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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 | - |
| indicatory | (adjective) (usually followed by `of') pointing out or revealing clearly | Synonyms: indicative, revelatory, significative, suggestive |
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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 | - |
| inflammatory | (adjective) arousing to action or rebellion | Synonyms: incendiary, incitive, instigative, rabble-rousing, seditious |
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| (adjective) characterized or caused by inflammation | - |
| inflator | (noun) an air pump operated by hand to inflate something (as a tire) | Synonyms: inflater |
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| informatory | (adjective) providing or conveying information | Synonyms: informative |
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| ingratiatory | (adjective) calculated to please or gain favor | Synonyms: ingratiating, insinuating |
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| (adjective) pleasingly persuasive or intended to persuade | Synonyms: coaxing |
| 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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| initiatory | (adjective) serving to set in motion | Synonyms: first, inaugural, initiative, maiden |
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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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| inspiratory | (adjective) pertaining to the drawing in phase of respiration | - |
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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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| interrogatory | (adjective) relating to the use of or having the nature of an interrogation | Synonyms: interrogative |
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| (noun) formal systematic questioning | Synonyms: examination, interrogation |
| 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 |
| investigatory | (adjective) designed to find information or ascertain facts | Synonyms: fact-finding, investigative |
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| 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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| invitatory | (adjective) conveying an invitation | - |
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| judicatory | (noun) the system of law courts that administer justice and constitute the judicial branch of government | Synonyms: judicature, judicial system, judiciary |
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| justificatory | (adjective) attempting to justify or defend in speech or writing | Synonyms: defensive, justificative |
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| (adjective) providing justification | Synonyms: justificative, vindicatory |
| 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 |
| 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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| lachrymatory | (adjective) relating to or prompting tears | Synonyms: lacrimatory |
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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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| lacrimatory | (adjective) relating to or prompting tears | Synonyms: lachrymatory |
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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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| laudatory | (adjective) full of or giving praise | Synonyms: praiseful, praising |
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| lavatory | (noun) a room or building equipped with one or more toilets | Synonyms: bathroom, can, john, lav, privy, toilet |
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| (noun) a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face | Synonyms: basin, washbasin, washbowl, washstand |
| (noun) a toilet that is cleaned of waste by the flow of water through it | Synonyms: flush toilet |
| legislator | (noun) someone who makes or enacts laws | - |
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| legislatorship | (noun) the office of legislator | - |
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| levator | (noun) a muscle that serves to lift some body part (as the eyelid or lip) | - |
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| levorotatory | (adjective) rotating to the left | Synonyms: left-handed, levorotary |
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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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| mandatorily | (adverb) in a manner that cannot be evaded | Synonyms: compulsorily, obligatorily |
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| mandatory | (adjective) required by rule | Synonyms: compulsory, required |
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| (noun) a territory surrendered by Turkey or Germany after World War I and put under the tutelage of some other European power until they are able to stand by themselves | Synonyms: mandate |
| (noun) the recipient of a mandate | Synonyms: mandatary |
| 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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| mediatorial | (adjective) of or relating to a mediator or the duties of a mediator | - |
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| mediatory | (adjective) of or related to or directed toward mediation | - |
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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 |
| minatory | (adjective) threatening or foreshadowing evil or tragic developments | Synonyms: baleful, forbidding, menacing, minacious, ominous, sinister, threatening |
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| minicalculator | (noun) (old-fashioned) a very small handheld calculator. | - |
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| mitigatory | (adjective) moderating pain or sorrow by making it easier to bear | Synonyms: alleviative, alleviatory, lenitive, mitigative, palliative |
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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 | - |
| 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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| natatorium | (noun) pool that provides a facility for swimming | Synonyms: swimming bath, swimming pool |
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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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| nonexploratory | (adjective) not exploratory | Synonyms: nonexplorative, unexplorative, unexploratory |
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