| inquisitor | (noun) a questioner who is excessively harsh | Synonyms: interrogator |
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| inspector | (noun) an investigator who observes carefully | Synonyms: examiner |
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| (noun) a high ranking police officer | - |
| 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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| instructor | (noun) a person whose occupation is teaching | Synonyms: teacher |
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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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| interceptor | (noun) a fast maneuverable fighter plane designed to intercept enemy aircraft | - |
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| intercessor | (noun) a negotiator who acts as a link between parties | Synonyms: go-between, intermediary, intermediator, mediator |
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| interior | (noun) the inner or enclosed surface of something | Synonyms: inside |
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| (noun) the region that is inside of something | Synonyms: inside |
| interlocutor | (noun) a person who takes part in a conversation | Synonyms: conversational partner |
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| (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 |
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| interoceptor | (noun) any receptor that responds to stimuli inside the body | Synonyms: enteroceptor |
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| interrogator | (noun) a questioner who is excessively harsh | Synonyms: inquisitor |
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| intervenor | (noun) (law) a party who interposes in a pending proceeding | - |
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| invalidator | (noun) an official who can invalidate or nullify | Synonyms: nullifier, voider |
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| inventor | (noun) someone who is the first to think of or make something | Synonyms: artificer, discoverer |
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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 |
| investor | (noun) someone who commits capital in order to gain financial returns | - |
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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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| jailor | (noun) someone who guards prisoners | Synonyms: gaoler, jailer, prison guard, screw, turnkey |
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| janitor | (noun) someone employed to clean and maintain a building | - |
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| junior | (noun) the younger of two persons | - |
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| (noun) a third-year undergraduate | - |
| (noun) term of address for a disrespectful and annoying male | - |
| juror | (noun) someone who serves (or waits to be called to serve) on a jury | - |
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| komondor | (noun) Hungarian breed of large powerful shaggy-coated white dog; used also as guard dog | - |
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| kor | (noun) an ancient Hebrew unit of capacity equal to 10 baths or 10 ephahs | Synonyms: homer |
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| kwashiorkor | (noun) severe malnutrition in children resulting from a diet excessively high in carbohydrates and low in protein | - |
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| labor | (noun) productive work (especially physical work done for wages) | Synonyms: labour, toil |
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| (noun) any piece of work that is undertaken or attempted | Synonyms: labour, project, task, undertaking |
| (noun) a social class comprising those who do manual labor or work for wages | Synonyms: labour, proletariat, working class |
| (noun) an organized attempt by workers to improve their status by united action (particularly via labor unions) or the leaders of this movement | Synonyms: labor movement, labour, trade union movement |
| (noun) concluding state of pregnancy; from the onset of contractions to the birth of a child | Synonyms: childbed, confinement, labour, lying-in, parturiency, travail |
| 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) | - |
| languor | (noun) inactivity; showing an unusual lack of energy | Synonyms: flatness, lethargy, phlegm, sluggishness |
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| (noun) a relaxed comfortable feeling | Synonyms: dreaminess |
| (noun) a feeling of lack of interest or energy | Synonyms: lassitude, listlessness |
| (noun) oppressively still air | - |
| 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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| lector | (noun) a public lecturer at certain universities | Synonyms: lecturer, reader |
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| (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 | - |
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| lessor | (noun) someone who grants a lease | Synonyms: lease giver |
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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 |
| liquor | (noun) an alcoholic beverage that is distilled rather than fermented | Synonyms: booze, hard drink, hard liquor, John Barleycorn, spirits, strong drink |
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| (noun) the liquid in which vegetables or meat have been cooked | Synonyms: pot likker, pot liquor |
| (noun) a liquid substance that is a solution (or emulsion or suspension) used or obtained in an industrial process | - |
| 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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| major | (noun) the principal field of study of a student at a university | - |
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| (noun) a commissioned military officer in the United States Army or Air Force or Marines; below lieutenant colonel and above captain | - |
| (noun) a university student who is studying a particular field as the principal subject | - |
| malefactor | (noun) someone who has committed a crime or has been legally convicted of a crime | Synonyms: criminal, crook, felon, outlaw |
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| malodor | (noun) a distinctive odor that is offensively unpleasant | Synonyms: fetor, foetor, malodour, mephitis, reek, stench, stink |
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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 | - |
| maniraptor | (noun) advanced carnivorous theropod; regarded as surviving today as living birds | - |
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| manor | (noun) the mansion of a lord or wealthy person | Synonyms: manor house |
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| (noun) the landed estate of a lord (including the house on it) | - |
| markhoor | (noun) large Himalayan goat with large spiraled horns | Synonyms: Capra falconeri, markhor |
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| markhor | (noun) large Himalayan goat with large spiraled horns | Synonyms: Capra falconeri, markhoor |
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| masturbator | (noun) a person who practices masturbation | Synonyms: onanist |
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| matador | (noun) the principal bullfighter who is appointed to make the final passes and kill the bull | - |
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| mayor | (noun) the head of a city government | Synonyms: city manager |
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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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| mentor | (noun) a wise and trusted guide and advisor | Synonyms: wise man |
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| metaphor | (noun) a figure of speech in which an expression is used to refer to something that it does not literally denote in order to suggest a similarity | - |
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| meteor | (noun) (astronomy) any of the small solid extraterrestrial bodies that hits the earth's atmosphere | Synonyms: meteoroid |
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| (noun) a streak of light in the sky at night that results when a meteoroid hits the earth's atmosphere and air friction causes the meteoroid to melt or vaporize or explode | Synonyms: shooting star |
| micrometeor | (noun) a meteorite or meteoroid so small that it drifts down to earth without becoming intensely heated in the atmosphere | Synonyms: micrometeorite, micrometeoroid |
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| microprocessor | (noun) integrated circuit semiconductor chip that performs the bulk of the processing and controls the parts of a system | - |
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| microsensor | (noun) A submicrometer- to millimeter-size device that converts a nonelectrical physical or chemical quantity, such as pressure, acceleration, temperature, or gas concentration, into an electrical signal; it is generally able to offer better sensitivity, accuracy, dynamic range, and reliability, as well as lower power consumption, compared to larger counterparts. | - |
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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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| minor | (noun) a young person of either sex | Synonyms: child, fry, kid, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster |
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| mirror | (noun) polished surface that forms images by reflecting light | - |
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| (noun) a faithful depiction or reflection | - |
| misbehavior | (noun) improper or wicked or immoral behavior | Synonyms: misbehaviour, misdeed |
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| misdemeanor | (noun) a crime less serious than a felony | Synonyms: infraction, infringement, misdemeanour, violation |
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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 | - |
| monitor | (noun) any of various large tropical carnivorous lizards of Africa and Asia and Australia; fabled to warn of crocodiles | Synonyms: monitor lizard, varan |
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| (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 |
| moor | (noun) open land usually with peaty soil covered with heather and bracken and moss | Synonyms: moorland |
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| mortgagor | (noun) the person who gives a mortgage in return for money to be repaid | Synonyms: mortgager |
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| motivator | (noun) a positive motivational influence | Synonyms: incentive, inducement |
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| motor | (noun) machine that converts other forms of energy into mechanical energy and so imparts motion | - |
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| (noun) a nonspecific agent that imparts motion | - |
| mucor | (noun) any mold of the genus Mucor | - |
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| multiprocessor | (noun) a computer that uses two or more processing units under integrated control | - |
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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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| neighbor | (noun) a nearby object of the same kind | Synonyms: neighbour |
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| (noun) a person who lives (or is located) near another | Synonyms: neighbour |
| newsvendor | (noun) someone who sells newspapers | Synonyms: newsagent, newsdealer, newsstand operator |
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| nominator | (noun) someone who proposes a candidate for appointment or election | - |
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| nonconductor | (noun) a material such as glass or porcelain with negligible electrical or thermal conductivity | Synonyms: dielectric, insulator |
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| numerator | (noun) the dividend of a fraction | - |
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| objector | (noun) a person who dissents from some established policy | Synonyms: contestant, dissenter, dissident, protester |
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| obliterator | (noun) an eliminator that does away with all traces | - |
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| obstructor | (noun) any structure that makes progress difficult | Synonyms: impediment, impedimenta, obstructer, obstruction |
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| (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) | - |
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| oculomotor | (noun) supplies extrinsic muscles of the eye | Synonyms: nervus oculomotorius, oculomotor nerve, third cranial nerve |
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| odor | (noun) any property detected by the olfactory system | Synonyms: aroma, odour, olfactory property, scent, smell |
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| (noun) the sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form | Synonyms: odour, olfactory perception, olfactory sensation, smell |
| offeror | (noun) someone who presents something to another for acceptance or rejection | Synonyms: offerer |
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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 | - |
| oppressor | (noun) a person of authority who subjects others to undue pressures | - |
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| 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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