singing vs chorus

singing and chorus both are nouns.

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

singing (noun)	chorus (noun)
the act of singing vocal music	the part of a song where a soloist is joined by a group of singers
disclosing information or giving evidence about another	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

singing (adjective)	chorus (adjective)
smooth and flowing

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