chorus vs chorus line

chorus and chorus line both are nouns.

Word	Noun	Adjective	Verb	Adverb
chorus	Yes	No	Yes	No
chorus line	Yes	No	No	No

As nouns, chorus and chorus line are synonyms defined as:

chorus and chorus line: a body of dancers or singers who perform together

chorus (noun)	chorus line (noun)
the part of a song where a soloist is joined by a group of singers	a body of dancers or singers who perform together
any utterance produced simultaneously by a group
a group of people assembled to sing together
a body of dancers or singers who perform together
a company of actors who comment (by speaking or singing in unison) on the action in a classical Greek play

chorus (verb)	chorus line (verb)
utter in unison
sing in a choir