Northman vs Norse

Northman and Norse both are nouns.

Word	Noun	Adjective	Verb	Adverb
Northman	Yes	No	No	No
Norse	Yes	Yes	No	No

As nouns, Northman and Norse are synonyms defined as:

Other synonyms of Northman include Scandinavian.

Northman (noun)	Norse (noun)
an inhabitant of Scandinavia	the northern family of Germanic languages that are spoken in Scandinavia and Iceland
	a native or inhabitant of Norway
	an inhabitant of Scandinavia

Northman (adjective)	Norse (adjective)
	of or relating to Norway or its people or culture or language
	of or relating to Scandinavia or its peoples or cultures