| instructorship | (noun) the position of instructor | - |
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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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| 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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| interrogatory | (noun) formal systematic questioning | Synonyms: examination, interrogation |
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| introductoriness | (noun) The quality of being introducing; of giving a preview or idea of. | - |
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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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| inventory | (noun) making an itemized list of merchandise or supplies on hand | Synonyms: inventorying, stock-taking, stocktaking |
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| (noun) the merchandise that a shop has on hand | Synonyms: stock |
| (noun) a collection of resources | Synonyms: armory, armoury |
| (noun) a detailed list of all the items in stock | Synonyms: stock list |
| (noun) (accounting) the value of a firm's current assets including raw materials and work in progress and finished goods | - |
| inventorying | (noun) making an itemized list of merchandise or supplies on hand | Synonyms: inventory, stock-taking, stocktaking |
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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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| janitor | (noun) someone employed to clean and maintain a building | - |
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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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| ketorolac | (noun) nonsteroidal anti-inflammatory (trade name Torodal) that is given only orally | Synonyms: Torodal |
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| 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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| 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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| 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 |
| 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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| 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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| 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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| litoral | (noun) the region of the shore of a lake or sea or ocean | Synonyms: littoral, littoral zone, sands |
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| littoral | (noun) the region of the shore of a lake or sea or ocean | Synonyms: litoral, littoral zone, sands |
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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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| 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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| mandator | (noun) an authority who issues a mandate | - |
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| mandatory | (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 |
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| (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 | - |
| maniraptor | (noun) advanced carnivorous theropod; regarded as surviving today as living birds | - |
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| manufactory | (noun) a plant consisting of one or more buildings with facilities for manufacturing | Synonyms: factory, manufacturing plant, mill |
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| 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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| mentor | (noun) a wise and trusted guide and advisor | Synonyms: wise man |
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| mentoree | (noun) one who is being mentored | Synonyms: mentee |
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| meritoriousness | (noun) the quality of being deserving (e.g., deserving assistance) | Synonyms: deservingness, merit |
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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 | - |
| moderatorship | (noun) the position of moderator | - |
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| 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 |
| monitoring | (noun) the act of observing something (and sometimes keeping a record of it) | - |
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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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| 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 | - |
| motorbike | (noun) small motorcycle with a low frame and small wheels and elevated handlebars | Synonyms: minibike |
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| motorboat | (noun) a boat propelled by an internal-combustion engine | Synonyms: powerboat |
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| motorbus | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorcoach, omnibus, passenger vehicle |
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| motorcade | (noun) a procession of people traveling in motor cars | - |
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| motorcar | (noun) a motor vehicle with four wheels; usually propelled by an internal combustion engine | Synonyms: auto, automobile, car, machine |
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| motorcoach | (noun) a vehicle carrying many passengers; used for public transport | Synonyms: autobus, bus, charabanc, coach, double-decker, jitney, motorbus, omnibus, passenger vehicle |
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| motorcycle | (noun) a motor vehicle with two wheels and a strong frame | Synonyms: bike |
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| motorcycling | (noun) riding a motorcycle | - |
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| motorcyclist | (noun) a traveler who rides a motorcycle | - |
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| motoring | (noun) the act of driving an automobile | - |
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| motorisation | (noun) the act of motorizing (equipping with motors or with motor vehicles) | Synonyms: motorization |
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| motorist | (noun) someone who drives (or travels in) an automobile | Synonyms: automobilist |
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| motorization | (noun) the act of motorizing (equipping with motors or with motor vehicles) | Synonyms: motorisation |
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| motorman | (noun) the operator of streetcar | - |
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| motormouth | (noun) someone who talks incessantly | - |
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| motortruck | (noun) an automotive vehicle suitable for hauling | Synonyms: truck |
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| motorway | (noun) a broad highway designed for high-speed traffic | Synonyms: expressway, freeway, pike, state highway, superhighway, throughway, thruway |
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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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| nonconductor | (noun) a material such as glass or porcelain with negligible electrical or thermal conductivity | Synonyms: dielectric, insulator |
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| notoriety | (noun) the state of being known for some unfavorable act or quality | Synonyms: ill fame |
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| notornis | (noun) flightless New Zealand birds similar to gallinules | Synonyms: Notornis mantelli, takahe |
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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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| observatory | (noun) a building designed and equipped to observe astronomical phenomena | - |
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| (noun) a structure commanding a wide view of its surroundings | Synonyms: lookout, lookout station, observation tower |
| 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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| octoroon | (noun) an offspring of a quadroon and a white parent; a person who is one-eighth black | - |
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| oculomotor | (noun) supplies extrinsic muscles of the eye | Synonyms: nervus oculomotorius, oculomotor nerve, third cranial nerve |
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| offertory | (noun) the offerings of the congregation at a religious service | - |
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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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| oratorio | (noun) a musical composition for voices and orchestra based on a religious text | Synonyms: cantata |
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| oratory | (noun) addressing an audience formally (usually a long and rhetorical address and often pompous) | - |
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