lavatory vs toilet

lavatory and toilet both are nouns.

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

As nouns, lavatory and toilet are synonyms defined as:

lavatory and toilet: a room or building equipped with one or more toilets

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

As nouns, toilet is a hypernym of lavatory; that is, toilet is a word with a broader meaning than lavatory:

Other hypernyms of lavatory include can, commode, crapper, pot, potty, stool, throne.

lavatory (noun)	toilet (noun)
a room or building equipped with one or more toilets	the act of dressing and preparing yourself
a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face	a room or building equipped with one or more toilets
a toilet that is cleaned of waste by the flow of water through it	a plumbing fixture for defecation and urination
	misfortune resulting in lost effort or money