disc vs acetate disk

disc and acetate disk both are nouns.

Word	Noun	Adjective	Verb	Adverb
disc	Yes	No	No	No
acetate disk	Yes	No	No	No

As nouns, acetate disk is a hyponym of disc; that is, acetate disk is a word with a more specific, narrower meaning than disc:

disc (noun)	acetate disk (noun)
a flat circular plate	a disk coated with cellulose acetate
sound recording consisting of a disk with a continuous groove; used to reproduce music by rotating while a phonograph needle tracks in the groove
(computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored
something with a round shape resembling a flat circular plate