private vs backstage

private and backstage both are nouns.

Word	Noun	Adjective	Verb	Adverb
private	Yes	Yes	No	No
backstage	Yes	Yes	No	Yes

private (noun)	backstage (noun)
an enlisted man of the lowest rank in the Army or Marines	a stage area out of sight of the audience

private (adjective)	backstage (adjective)
confined to particular persons or groups or providing privacy	concealed from public view or attention
not expressed
concerning one person exclusively
concerning things deeply private and personal

private (adverb)	backstage (adverb)
	in or to a backstage area of a theater
	out of view of the public; behind the scenes