Norse deity vs immortal

Norse deity and immortal both are nouns.

Word	Noun	Adjective	Verb	Adverb
Norse deity	Yes	No	No	No
immortal	Yes	Yes	No	No

As nouns, immortal is a hypernym of Norse deity; that is, immortal is a word with a broader meaning than Norse deity:

Norse deity: a deity worshipped by the ancient Norsemen
immortal: any supernatural being worshipped as controlling some part of the world or some aspect of life or who is the personification of a force

Other hypernyms of Norse deity include deity, divinity, god.

Norse deity (noun)	immortal (noun)
a deity worshipped by the ancient Norsemen	any supernatural being worshipped as controlling some part of the world or some aspect of life or who is the personification of a force
	a person (such as an author) of enduring fame

Norse deity (adjective)	immortal (adjective)
	not subject to death