CD vs compact disc

CD and compact disc both are nouns.

Word	Noun	Adjective	Verb	Adverb
CD	Yes	No	No	No
compact disc	Yes	No	No	No

As nouns, CD and compact disc are synonyms defined as:

CD and compact disc: a digitally encoded recording on an optical disk that is smaller than a phonograph record; played back by a laser

Other synonyms of CD include compact disk.

CD (noun)	compact disc (noun)
a digitally encoded recording on an optical disk that is smaller than a phonograph record; played back by a laser	a digitally encoded recording on an optical disk that is smaller than a phonograph record; played back by a laser
a debt instrument issued by a bank; usually pays interest