private vs offstage

private and offstage both are nouns.

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

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

private (adjective)	offstage (adjective)
confined to particular persons or groups or providing privacy	situated or taking place in the area of a stage not visible to the audience
not expressed	concealed from public view or attention
concerning one person exclusively
concerning things deeply private and personal

private (adverb)	offstage (adverb)
	behind the scenes; not on stage
	not in public