Gorgon vs Stheno

Gorgon and Stheno both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gorgon	Yes	No	No	No
Stheno	Yes	No	No	No

As nouns, Stheno is a hyponym of Gorgon; that is, Stheno is a word with a more specific, narrower 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
Stheno: (Greek mythology) the eldest of the three Gorgons

Other hyponyms of Gorgon include Medusa, Euryale.

Gorgon (noun)	Stheno (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	(Greek mythology) the eldest of the three Gorgons