Gog and Magog vs mythical being

Gog and Magog and mythical being both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gog and Magog	Yes	No	No	No
mythical being	Yes	No	No	No

As nouns, mythical being is a hypernym of Gog and Magog; that is, mythical being is a word with a broader meaning than Gog and Magog:

Gog and Magog: biblical names of the enemies of God's people who wage war against God at the end of the world
mythical being: an imaginary being of myth or fable

Gog and Magog (noun)	mythical being (noun)
biblical names of the enemies of God's people who wage war against God at the end of the world	an imaginary being of myth or fable