ratchet vs ratchet wheel

ratchet and ratchet wheel both are nouns.

Word	Noun	Adjective	Verb	Adverb
ratchet	Yes	No	Yes	No
ratchet wheel	Yes	No	No	No

ratchet (noun)	ratchet wheel (noun)
mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction	toothed wheel held in place by a pawl or detent and turned by a lever

ratchet (verb)	ratchet wheel (verb)
move by degrees in one direction only