spur gear vs geared wheel

spur gear and geared wheel both are nouns.

Word	Noun	Adjective	Verb	Adverb
spur gear	Yes	No	No	No
geared wheel	Yes	No	No	No

As nouns, geared wheel is a hypernym of spur gear; that is, geared wheel is a word with a broader meaning than spur gear:

spur gear: gear wheels that mesh in the same plane
geared wheel: a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion

Other hypernyms of spur gear include cogwheel, gear, gear wheel.

spur gear (noun)	geared wheel (noun)
gear wheels that mesh in the same plane	a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion