ratchet screwdriver vs ratchet

ratchet screwdriver and ratchet both are nouns.

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

ratchet screwdriver (noun)	ratchet (noun)
a screwdriver with a ratchet (so the blade turns in only one direction) and a spiral in the handle (so the blade rotates) with downward pressure on the handle	mechanical device consisting of a toothed wheel or rack engaged with a pawl that permits it to move in only one direction

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