occupant vs dweller

occupant and dweller both are nouns.

Word	Noun	Adjective	Verb	Adverb
occupant	Yes	No	No	No
dweller	Yes	No	No	No

As nouns, dweller is a hypernym of occupant; that is, dweller is a word with a broader meaning than occupant:

occupant: someone who lives at a particular place for a prolonged period or who was born there
dweller: a person who inhabits a particular place

Other hypernyms of occupant include denizen, habitant, indweller, inhabitant.

occupant (noun)	dweller (noun)
someone who lives at a particular place for a prolonged period or who was born there	a person who inhabits a particular place