gear vs engine

gear and engine both are nouns.

Word	Noun	Adjective	Verb	Adverb
gear	Yes	No	Yes	No
engine	Yes	No	No	No

gear (noun)	engine (noun)
a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion	motor that converts thermal energy to mechanical work
equipment consisting of miscellaneous articles needed for a particular operation or sport etc.	a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks
wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed	an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc.
a mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle)	something used to achieve a purpose

gear (verb)	engine (verb)
set the level or character of