worm wheel vs geared wheel

worm wheel and geared wheel both are nouns.

Word	Noun	Adjective	Verb	Adverb
worm wheel	Yes	No	No	No
geared wheel	Yes	No	No	No

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

worm wheel: gear with the thread of a worm
geared wheel: a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion

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

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