Norse deity vs Vidar

Norse deity and Vidar both are nouns.

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

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

Norse deity: a deity worshipped by the ancient Norsemen
Vidar: (Norse mythology) one of the Aesir; son of Odin; avenges his parent by slaying Fenrir at Ragnarok

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

Norse deity (noun)	Vidar (noun)
a deity worshipped by the ancient Norsemen	(Norse mythology) one of the Aesir; son of Odin; avenges his parent by slaying Fenrir at Ragnarok