| gearmotor | (noun) a motor combined with a set of speed-reducing gears. | - |
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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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| 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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| oculomotor | (noun) supplies extrinsic muscles of the eye | Synonyms: nervus oculomotorius, oculomotor nerve, third cranial nerve |
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| otorhinolaryngologist | (noun) a specialist in the disorders of the ear or nose or throat | Synonyms: ear-nose-and-throat doctor, ENT man, otolaryngologist, rhinolaryngologist |
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| otorhinolaryngology | (noun) the medical specialty that deals with diseases of the ear, nose and throat | Synonyms: otolaryngology, rhinolaryngology |
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| otorrhea | (noun) discharge from the external ear | - |
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| photoretinitis | (noun) damage to the retina resulting from exposure of the eye to the sun without adequate protection | - |
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| potoroo | (noun) Australian rat kangaroos | - |
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| rotor | (noun) rotating mechanism consisting of an assembly of rotating airfoils | - |
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| (noun) the rotating armature of a motor or generator | Synonyms: rotor coil |
| (noun) the revolving bar of a distributor | - |