occupant vs denizen

occupant and denizen both are nouns.

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

As nouns, denizen is a hypernym of occupant; that is, denizen 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
denizen: a person who inhabits a particular place

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

occupant (noun)	denizen (noun)
someone who lives at a particular place for a prolonged period or who was born there	a plant or animal naturalized in a region
	a person who inhabits a particular place