confidential vs private

confidential is not a noun while private is a noun.

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

confidential (noun)	private (noun)
	an enlisted man of the lowest rank in the Army or Marines

confidential (adjective)	private (adjective)
the level of official classification for documents next above restricted and below secret; available only to persons authorized to see documents so classified	confined to particular persons or groups or providing privacy
denoting confidence or intimacy	not expressed
entrusted with private information and the confidence of another	concerning one person exclusively
(of information) given in confidence or in secret	concerning things deeply private and personal