vocalizing vs Greek chorus

vocalizing and Greek chorus both are nouns.

Word	Noun	Adjective	Verb	Adverb
vocalizing	Yes	No	No	No
Greek chorus	Yes	No	No	No

vocalizing (noun)	Greek chorus (noun)
the act of singing vocal music	a company of actors who comment (by speaking or singing in unison) on the action in a classical Greek play