tenant vs boarder

tenant and boarder both are nouns.

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

As nouns, boarder is a hyponym of tenant; that is, boarder 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
boarder: a tenant in someone's house

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

tenant (noun)	boarder (noun)
someone who pays rent to use land or a building or a car that is owned by someone else	a tenant in someone's house
any occupant who dwells in a place	a pupil who lives at school during term time
a holder of buildings or lands by any kind of title (as ownership or lease)	someone who forces their way aboard ship

tenant (verb)	boarder (verb)
occupy as a tenant