tenant vs lessee

tenant and lessee both are nouns.

Word	Noun	Adjective	Verb	Adverb
tenant	Yes	No	Yes	No
lessee	Yes	No	No	No

As nouns, lessee is a hyponym of tenant; that is, lessee is a word with a more specific, narrower meaning than tenant:

tenant: someone who pays rent to use land or a building or a car that is owned by someone else
lessee: a tenant who holds a lease

Other hyponyms of tenant include leaseholder, boarder, lodger, roomer.

tenant (noun)	lessee (noun)
someone who pays rent to use land or a building or a car that is owned by someone else	a tenant who holds a lease
any occupant who dwells in a place
a holder of buildings or lands by any kind of title (as ownership or lease)

tenant (verb)	lessee (verb)
occupy as a tenant