ingenuous vs heart-to-heart

ingenuous is not a noun while heart-to-heart is a noun.

Word	Noun	Adjective	Verb	Adverb
ingenuous	No	Yes	No	No
heart-to-heart	Yes	Yes	No	No

ingenuous (noun)	heart-to-heart (noun)
	an intimate talk in private

ingenuous (adjective)	heart-to-heart (adjective)
characterized by an inability to mask your feelings; not devious	openly straightforward and direct without reserve or secretiveness
lacking in sophistication or worldliness