European vs denizen

European and denizen both are nouns.

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

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

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

European (noun)	denizen (noun)
a native or inhabitant of Europe	a plant or animal naturalized in a region
	a person who inhabits a particular place

European (adjective)	denizen (adjective)
of or relating to or characteristic of Europe or the people of Europe