| indoor | (adjective) located, suited for, or taking place within a building | - |
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| (adjective) within doors | - |
| inductor | (noun) an electrical device (typically a conducting coil) that introduces inductance into a circuit | Synonyms: inductance |
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| inferior | (adjective) written or printed below and to one side of another character | Synonyms: subscript |
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| (adjective) of or characteristic of low rank or importance | - |
| (adjective) of low or inferior quality | - |
| (adjective) having an orbit between the sun and the Earth's orbit | - |
| (adjective) lower than a given reference point | - |
| (adjective) falling short of some prescribed norm | Synonyms: deficient, substandard |
| (noun) a character or symbol set or printed or written beneath or slightly below and to the side of another character | Synonyms: subscript |
| (noun) one of lesser rank or station or quality | - |
| 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 |
| 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 |
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| inhibitor | (noun) a substance that retards or stops an activity | - |
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| initiator | (noun) a person who initiates a course of action | Synonyms: instigator |
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| injector | (noun) a contrivance for injecting (e.g., water into the boiler of a steam engine or particles into an accelerator etc.) | - |
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| (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 |
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| inoculator | (noun) a medical practitioner who inoculates people against diseases | Synonyms: vaccinator |
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| 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 | (adjective) situated within or suitable for inside a building | - |
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| (adjective) inside the country | Synonyms: home, internal, national |
| (adjective) of or coming from the middle of a region or country | Synonyms: midland, upcountry |
| (adjective) inside and toward a center | - |
| (adjective) located inward | Synonyms: inner, internal |
| (noun) the inner or enclosed surface of something | Synonyms: inside |
| (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 | (adjective) younger; lower in rank; shorter in length of tenure or service | - |
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| (adjective) used of the third or next to final year in United States high school or college | Synonyms: next-to-last, third-year |
| (adjective) including or intended for youthful persons | - |
| (noun) the younger of two persons | - |
| (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 |
| (verb) undergo the efforts of childbirth | Synonyms: labour |
| (verb) work hard | Synonyms: dig, drudge, fag, grind, labour, moil, toil, travail |
| (verb) strive and make an effort to reach a goal | Synonyms: drive, labour, push, tug |
| 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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| locomotor | (adjective) of or relating to locomotion | Synonyms: locomotive |
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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 | (adjective) greater in number or size or amount | - |
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| (adjective) greater in scope or effect | - |
| (adjective) of full legal age | - |
| (adjective) (of a scale or mode) having half steps between the third and fourth degrees and the seventh and eighth degrees | - |
| (adjective) of the field of academic study in which one concentrates or specializes | - |
| (adjective) of greater importance or stature or rank | - |
| (adjective) of greater seriousness or danger | - |
| (adjective) of the elder of two boys with the same family name | - |
| (noun) the principal field of study of a student at a university | - |
| (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 | - |
| (verb) have as one's principal field of study | - |
| 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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| (verb) serve as a teacher or trusted counselor | - |
| 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 | (adjective) inferior in number or size or amount | - |
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| (adjective) lesser in scope or effect | - |
| (adjective) not of legal age | Synonyms: nonaged, underage |
| (adjective) (of a scale or mode) having half steps between the second and third degrees, and (usually) the fifth and sixth degrees, and the seventh and eighth degrees | - |
| (adjective) of your secondary field of academic concentration or specialization | - |
| (adjective) of lesser importance or stature or rank | - |
| (adjective) of lesser seriousness or danger | - |
| (adjective) of the younger of two boys with the same family name | - |
| (adjective) relatively moderate, limited, or small | Synonyms: modest, pocket-size, pocket-sized, small-scale, small |
| (adjective) warranting only temporal punishment | Synonyms: venial |
| (noun) a young person of either sex | Synonyms: child, fry, kid, nestling, nipper, shaver, small fry, tiddler, tike, tyke, youngster |
| (verb) have as one's secondary field of study | - |
| mirror | (noun) polished surface that forms images by reflecting light | - |
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| (noun) a faithful depiction or reflection | - |
| (verb) reflect or resemble | - |
| (verb) reflect as if in a mirror | - |
| 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 |
| (verb) keep tabs on; keep an eye on; keep under surveillance | Synonyms: supervise |
| (verb) check, track, or observe by means of a receiver | - |
| moor | (noun) open land usually with peaty soil covered with heather and bracken and moss | Synonyms: moorland |
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| (verb) secure with cables or ropes | - |
| (verb) secure in or as if in a berth or dock | Synonyms: berth, tie up |
| (verb) come into or dock at a wharf | Synonyms: berth, wharf |
| 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 | (adjective) causing or able to cause motion | Synonyms: motive |
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| (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 |
| mucor | (noun) any mold of the genus Mucor | - |
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| multicolor | (adjective) having sections or patches colored differently and usually brightly | Synonyms: calico, motley, multi-color, multi-colored, multi-colour, multi-coloured, multicolored, multicolour, multicoloured, painted, particolored, particoloured, piebald, pied, varicolored, varicoloured |
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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 |
| (verb) be located near or adjacent to | Synonyms: neighbour |
| (verb) live or be located as a neighbor | Synonyms: neighbour |
| neuromotor | (adjective) relating to a nerve fiber or impulse passing toward motor effectors | - |
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