restroom vs privy

restroom and privy both are nouns.

Word	Noun	Adjective	Verb	Adverb
restroom	Yes	No	No	No
privy	Yes	Yes	No	No

As nouns, privy is a hypernym of restroom; that is, privy is a word with a broader meaning than restroom:

Other hypernyms of restroom include facility, bathroom, can, john, lav, lavatory, toilet.

restroom (noun)	privy (noun)
a toilet that is available to the public	a small outbuilding with a bench having holes through which a user can defecate
	a room or building equipped with one or more toilets

restroom (adjective)	privy (adjective)
	(followed by `to') informed about something secret or not generally known
	hidden from general view or use