disc vs coin blank

disc and coin blank both are nouns.

Word	Noun	Adjective	Verb	Adverb
disc	Yes	No	No	No
coin blank	Yes	No	No	No

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

disc (noun)	coin blank (noun)
a flat circular plate	a flat metal disk ready for stamping as a coin
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