cogwheel vs gear wheel

cogwheel and gear wheel both are nouns.

Word	Noun	Adjective	Verb	Adverb
cogwheel	Yes	No	No	No
gear wheel	Yes	No	No	No

As nouns, cogwheel and gear wheel are synonyms defined as:

cogwheel and gear wheel: a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion

Other synonyms of cogwheel include gear, geared wheel.

cogwheel (noun)	gear wheel (noun)
a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion	a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion