Norse deity vs Vanir

Norse deity and Vanir both are nouns.

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

As nouns, Vanir is a hyponym of Norse deity; that is, Vanir is a word with a more specific, narrower meaning than Norse deity:

Norse deity: a deity worshipped by the ancient Norsemen
Vanir: (Norse mythology) group of ancient gods sometimes in conflict with the Aesir

Other hyponyms of Norse deity include Aesir, Nanna, Norn, weird sister, Sigyn, Ull, Ullr, Vali, Vidar, Vithar, Vitharr.

Norse deity (noun)	Vanir (noun)
a deity worshipped by the ancient Norsemen	(Norse mythology) group of ancient gods sometimes in conflict with the Aesir