Vidar vs Vithar

Vidar and Vithar both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vidar	Yes	No	No	No
Vithar	Yes	No	No	No

As nouns, Vidar and Vithar are synonyms defined as:

Vidar and Vithar: (Norse mythology) one of the Aesir; son of Odin; avenges his parent by slaying Fenrir at Ragnarok

Other synonyms of Vidar include Vitharr.

Vidar (noun)	Vithar (noun)
(Norse mythology) one of the Aesir; son of Odin; avenges his parent by slaying Fenrir at Ragnarok	(Norse mythology) one of the Aesir; son of Odin; avenges his parent by slaying Fenrir at Ragnarok