cover version vs cover song

cover version and cover song both are nouns.

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

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

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

Other synonyms of cover version include cover.

cover version (noun)	cover song (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