lav vs toilet

lav and toilet both are nouns.

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

As nouns, lav and toilet are synonyms defined as:

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

lav (noun)	toilet (noun)
a room or building equipped with one or more toilets	the act of dressing and preparing yourself
	a room or building equipped with one or more toilets
	a plumbing fixture for defecation and urination
	misfortune resulting in lost effort or money