Northerner vs denizen

Northerner and denizen both are nouns.

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

As nouns, denizen is a hypernym of Northerner; that is, denizen is a word with a broader meaning than Northerner:

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

Northerner (noun)	denizen (noun)
an inhabitant of the North	a plant or animal naturalized in a region
an American who lives in the North (especially during the American Civil War)	a person who inhabits a particular place