Gorgon vs mythical monster

Gorgon and mythical monster both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gorgon	Yes	No	No	No
mythical monster	Yes	No	No	No

As nouns, mythical monster is a hypernym of Gorgon; that is, mythical monster is a word with a broader meaning than Gorgon:

Gorgon: (Greek mythology) any of three winged sister monsters and the mortal Medusa who had live snakes for hair; a glance at Medusa turned the beholder to stone
mythical monster: a monster renowned in folklore and myth

Other hypernyms of Gorgon include mythical creature.

Gorgon (noun)	mythical monster (noun)
(Greek mythology) any of three winged sister monsters and the mortal Medusa who had live snakes for hair; a glance at Medusa turned the beholder to stone	a monster renowned in folklore and myth