Fury vs Megaera

Fury and Megaera both are nouns.

Word	Noun	Adjective	Verb	Adverb
Fury	Yes	No	No	No
Megaera	Yes	No	No	No

As nouns, Megaera is a hyponym of Fury; that is, Megaera is a word with a more specific, narrower meaning than Fury:

Fury: (classical mythology) the hideous snake-haired monsters (usually three in number) who pursued unpunished criminals
Megaera: the one of the three Furies who punishes crimes of marital infidelity

Other hyponyms of Fury include Alecto, Tisiphone.

Fury (noun)	Megaera (noun)
(classical mythology) the hideous snake-haired monsters (usually three in number) who pursued unpunished criminals	the one of the three Furies who punishes crimes of marital infidelity