Charybdis vs vortex

Charybdis and vortex both are nouns.

Word	Noun	Adjective	Verb	Adverb
Charybdis	Yes	No	No	No
vortex	Yes	No	No	No

As nouns, vortex is a hypernym of Charybdis; that is, vortex is a word with a broader meaning than Charybdis:

Charybdis: (Greek mythology) a ship-devouring whirlpool lying on the other side of a narrow strait from Scylla
vortex: a powerful circular current of water (usually the result of conflicting tides)

Other hypernyms of Charybdis include maelstrom, whirlpool.

Charybdis (noun)	vortex (noun)
(Greek mythology) a ship-devouring whirlpool lying on the other side of a narrow strait from Scylla	a powerful circular current of water (usually the result of conflicting tides)
	the shape of something rotating rapidly