bevel gear vs cogwheel

bevel gear and cogwheel both are nouns.

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

As nouns, cogwheel is a hypernym of bevel gear; that is, cogwheel is a word with a broader meaning than bevel gear:

bevel gear: gears that mesh at an angle
cogwheel: a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion

Other hypernyms of bevel gear include gear, gear wheel, geared wheel.

bevel gear (noun)	cogwheel (noun)
gears that mesh at an angle	a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion