cover song vs cover version

cover song and cover version both are nouns.

Word	Noun	Adjective	Verb	Adverb
cover song	Yes	No	No	No
cover version	Yes	No	No	No

As nouns, cover song and cover version are synonyms defined as:

cover song and cover version: a recording of a song that was first recorded or made popular by somebody else

Other synonyms of cover song include cover.

cover song (noun)	cover version (noun)
a recording of a song that was first recorded or made popular by somebody else	a recording of a song that was first recorded or made popular by somebody else