| heritor | (noun) a person who is entitled by law or by the terms of a will to inherit the estate of another | Synonyms: heir, inheritor |
|---|
| hesitator | (noun) one who hesitates (usually out of fear) | Synonyms: hesitater, vacillator, waverer |
|---|
| ignitor | (noun) a device for lighting or igniting fuel or charges or fires | Synonyms: igniter, light, lighter |
|---|
| (noun) a substance used to ignite or kindle a fire | Synonyms: igniter, lighter |
| illustrator | (noun) an artist who makes illustrations (for books or magazines or advertisements etc.) | - |
|---|
| imitator | (noun) someone who copies the words or behavior of another | Synonyms: ape, aper, copycat, emulator |
|---|
| (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: impersonator |
| impersonator | (noun) someone who (fraudulently) assumes the appearance of another | Synonyms: imitator |
|---|
| impostor | (noun) a person who makes deceitful pretenses | Synonyms: fake, faker, fraud, imposter, pretender, pseud, pseudo, role player, sham, shammer |
|---|
| incinerator | (noun) a furnace for incinerating (especially to dispose of refuse) | - |
|---|
| 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 |
|---|
| indicator | (noun) a device for showing the operating condition of some system | - |
|---|
| (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 | - |
| inductor | (noun) an electrical device (typically a conducting coil) that introduces inductance into a circuit | Synonyms: inductance |
|---|
| infiltrator | (noun) an intruder (as troops) with hostile intent | - |
|---|
| (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 |
|---|
| inhalator | (noun) a dispenser that produces a chemical vapor to be inhaled in order to relieve nasal congestion | Synonyms: inhaler |
|---|
| (noun) a breathing device for administering long-term artificial respiration | Synonyms: respirator |
| inheritor | (noun) a person who is entitled by law or by the terms of a will to inherit the estate of another | Synonyms: heir, heritor |
|---|
| inhibitor | (noun) a substance that retards or stops an activity | - |
|---|
| initiator | (noun) a person who initiates a course of action | Synonyms: instigator |
|---|
| injector | (noun) a contrivance for injecting (e.g., water into the boiler of a steam engine or particles into an accelerator etc.) | - |
|---|
| (noun) An injector, ejector, steam ejector, steam injector, eductor-jet pump or thermocompressor is a type of pump. | Synonyms: eductor-jet pump, ejector, steam ejector, steam injector, thermocompressor |
| innovator | (noun) someone who helps to open up a new line of research or technology or art | Synonyms: groundbreaker, pioneer, trailblazer |
|---|
| inoculator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: vaccinator |
|---|
| inquisitor | (noun) a questioner who is excessively harsh | Synonyms: interrogator |
|---|
| inspector | (noun) an investigator who observes carefully | Synonyms: examiner |
|---|
| (noun) a high ranking police officer | - |
| instigator | (noun) a person who initiates a course of action | Synonyms: initiator |
|---|
| (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 | - |
|---|
| instructor | (noun) a person whose occupation is teaching | Synonyms: teacher |
|---|
| insulator | (noun) a material such as glass or porcelain with negligible electrical or thermal conductivity | Synonyms: dielectric, nonconductor |
|---|
| integrator | (noun) a measuring instrument for measuring the area of an irregular plane figure | Synonyms: planimeter |
|---|
| interceptor | (noun) a fast maneuverable fighter plane designed to intercept enemy aircraft | - |
|---|
| interlocutor | (noun) a person who takes part in a conversation | Synonyms: conversational partner |
|---|
| (noun) the performer in the middle of a minstrel line who engages the others in talk | Synonyms: middleman |
| intermediator | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediary, mediator |
|---|
| interoceptor | (noun) any receptor that responds to stimuli inside the body | Synonyms: enteroceptor |
|---|
| interrogator | (noun) a questioner who is excessively harsh | Synonyms: inquisitor |
|---|
| invalidator | (noun) an official who can invalidate or nullify | Synonyms: nullifier, voider |
|---|
| inventor | (noun) someone who is the first to think of or make something | Synonyms: artificer, discoverer |
|---|
| investigator | (noun) someone who investigates | - |
|---|
| (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 |
| investor | (noun) someone who commits capital in order to gain financial returns | - |
|---|
| invigilator | (noun) someone who watches examination candidates to prevent cheating | - |
|---|
| invigorator | (noun) an agent that gives or restores life or vigor | Synonyms: enlivener, quickener |
|---|
| janitor | (noun) someone employed to clean and maintain a building | - |
|---|
| 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 |
|---|
| 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 |
|---|
| laminator | (noun) Any of a range of machines used for lamination. | Synonyms: laminating machine |
|---|
| (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 |
|---|
| laudator | (noun) someone who communicates high praise | Synonyms: extoller, lauder |
|---|
| lector | (noun) a public lecturer at certain universities | Synonyms: lecturer, reader |
|---|
| (noun) someone who reads the lessons in a church service; someone ordained in a minor order of the Roman Catholic Church | Synonyms: reader |
| legislator | (noun) someone who makes or enacts laws | - |
|---|
| levator | (noun) a muscle that serves to lift some body part (as the eyelid or lip) | - |
|---|
| liberator | (noun) someone who releases people from captivity or bondage | - |
|---|
| 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 |
|---|
| (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 |
|---|
| locator | (noun) a person who fixes the boundaries of land claims | Synonyms: locater |
|---|
| locomotor | (adjective) of or relating to locomotion | Synonyms: locomotive |
|---|
| lubricator | (noun) a substance capable of reducing friction by making surfaces smooth or slippery | Synonyms: lube, lubricant, lubricating substance |
|---|
| machinator | (noun) a member of a conspiracy | Synonyms: coconspirator, conspirator, plotter |
|---|
| malefactor | (noun) someone who has committed a crime or has been legally convicted of a crime | Synonyms: criminal, crook, felon, outlaw |
|---|
| mandator | (noun) an authority who issues a mandate | - |
|---|
| manipulator | (noun) an agent that operates some apparatus or machine | Synonyms: operator |
|---|
| (noun) a person who handles things manually | - |
| maniraptor | (noun) advanced carnivorous theropod; regarded as surviving today as living birds | - |
|---|
| masturbator | (noun) a person who practices masturbation | Synonyms: onanist |
|---|
| mediator | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intercessor, intermediary, intermediator |
|---|
| mentor | (noun) a wise and trusted guide and advisor | Synonyms: wise man |
|---|
| (verb) serve as a teacher or trusted counselor | - |
| migrator | (noun) an animal (especially birds and fish) that travels between different habitats at particular times of the year | - |
|---|
| (noun) traveler who moves from one region or country to another | Synonyms: migrant |
| minicalculator | (noun) (old-fashioned) a very small handheld calculator. | - |
|---|
| moderator | (noun) someone who mediates disputes and attempts to avoid violence | - |
|---|
| (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 | - |
| monitor | (noun) any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles | Synonyms: monitor lizard, varan |
|---|
| (noun) a piece of electronic equipment that keeps track of the operation of a system continuously and warns of trouble | - |
| (noun) electronic equipment that is used to check the quality or content of electronic transmissions | - |
| (noun) display produced by a device that takes signals and displays them on a television screen or a computer monitor | Synonyms: monitoring device |
| (noun) someone who gives a warning so that a mistake can be avoided | Synonyms: admonisher, reminder |
| (noun) someone who supervises (an examination) | Synonyms: proctor |
| (verb) keep tabs on; keep an eye on; keep under surveillance | Synonyms: supervise |
| (verb) check, track, or observe by means of a receiver | - |
| motivator | (noun) a positive motivational influence | Synonyms: incentive, inducement |
|---|
| motor | (adjective) causing or able to cause motion | Synonyms: motive |
|---|
| (adjective) conveying information to the muscles from the CNS | Synonyms: centrifugal |
| (noun) machine that converts other forms of energy into mechanical energy and so imparts motion | - |
| (noun) a nonspecific agent that imparts motion | - |
| (verb) travel or be transported in a vehicle | Synonyms: drive |
| mutilator | (noun) a person who mutilates or destroys or disfigures or cripples | Synonyms: maimer, mangler |
|---|
| narrator | (noun) someone who tells a story | Synonyms: storyteller, teller |
|---|
| natator | (noun) a person who travels through the water by swimming | Synonyms: bather, swimmer |
|---|
| navigator | (noun) in earlier times, a person who explored by ship | - |
|---|
| (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 |
|---|
| neuromotor | (adjective) relating to a nerve fiber or impulse passing toward motor effectors | - |
|---|
| nominator | (noun) someone who proposes a candidate for appointment or election | - |
|---|
| nonconductor | (noun) a material such as glass or porcelain with negligible electrical or thermal conductivity | Synonyms: dielectric, insulator |
|---|
| numerator | (noun) the dividend of a fraction | - |
|---|
| objector | (noun) a person who dissents from some established policy | Synonyms: contestant, dissenter, dissident, protester |
|---|
| obliterator | (noun) an eliminator that does away with all traces | - |
|---|
| obstructor | (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstructer, obstruction |
|---|
| (noun) someone who systematically obstructs some action that others want to take | Synonyms: obstructer, obstructionist, resister, thwarter |
| obturator | (noun) a prosthesis used to close an opening (as to close an opening of the hard palate in cases of cleft palate) | - |
|---|
| oculomotor | (noun) supplies extrinsic muscles of the eye | Synonyms: nervus oculomotorius, oculomotor nerve, third cranial nerve |
|---|
| operator | (noun) an agent that operates some apparatus or machine | Synonyms: manipulator |
|---|
| (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 |
|---|
| orchestrator | (noun) an arranger who writes for orchestras | - |
|---|
| originator | (noun) someone who creates new things | Synonyms: conceiver, mastermind |
|---|
| oscillator | (noun) generator that produces sonic oscillations or alternating current | - |
|---|
| osculator | (noun) someone who kisses | Synonyms: kisser |
|---|
| osmoreceptor | (noun) sensory end organ that responds to changes in osmotic pressure | - |
|---|
| ovipositor | (noun) egg-laying tubular structure at the end of the abdomen in many female insects and some fishes | - |
|---|
| pastor | (noun) a person authorized to conduct religious worship | Synonyms: curate, minister, minister of religion, parson, rector |
|---|
| peculator | (noun) someone who violates a trust by taking (money) for his own use | Synonyms: defalcator, embezzler |
|---|
| penetrator | (noun) an intruder who passes into or through (often by overcoming resistance) | - |
|---|
| 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 |
|---|
| percolator | (noun) a coffeepot in which boiling water ascends through a central tube and filters back down through a basket of ground coffee beans | - |
|---|
| perpetrator | (noun) someone who perpetrates wrongdoing | Synonyms: culprit |
|---|
| persecutor | (noun) someone who torments | Synonyms: tormenter, tormentor |
|---|
| photocoagulator | (noun) surgical instrument containing a laser for use in photocoagulation | - |
|---|
| playactor | (noun) an actor who travels around the country presenting plays | Synonyms: barnstormer, play-actor, trouper |
|---|
| pollinator | (noun) an insect that carries pollen from one flower to another | - |
|---|
| postulator | (noun) someone who assumes or takes something for granted as the basis of an argument | - |
|---|
| (noun) (Roman Catholic Church) someone who proposes or pleads for a candidate for beatification or canonization | - |