lav vs privy

lav and privy both are nouns.

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

As nouns, lav and privy are synonyms defined as:

Other synonyms of lav include bathroom, can, john, lavatory, toilet.

lav (noun)	privy (noun)
a room or building equipped with one or more toilets	a small outbuilding with a bench having holes through which a user can defecate
	a room or building equipped with one or more toilets

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