cam vs distributor cam

cam and distributor cam both are nouns.

Word	Noun	Adjective	Verb	Adverb
cam	Yes	No	No	No
distributor cam	Yes	No	No	No

As nouns, distributor cam is a hyponym of cam; that is, distributor cam is a word with a more specific, narrower meaning than cam:

cam: a rotating disk shaped to convert circular into linear motion
distributor cam: the cam inside the distributor that rotates to contact spark plug terminals in the correct order

cam (noun)	distributor cam (noun)
a rotating disk shaped to convert circular into linear motion	the cam inside the distributor that rotates to contact spark plug terminals in the correct order