Greek deity vs Aether

Greek deity and Aether both are nouns.

Word	Noun	Adjective	Verb	Adverb
Greek deity	Yes	No	No	No
Aether	Yes	No	No	No

As nouns, Aether is a hyponym of Greek deity; that is, Aether is a word with a more specific, narrower meaning than Greek deity:

Greek deity: a deity worshipped by the ancient Greeks
Aether: personification of the sky or upper air breathed by the Olympians; son of Erebus and night or of Chaos and darkness

Other hyponyms of Greek deity include Grace, forest god, satyr, silenus, Moirae, Moirai, Muse, Pontos, Pontus, Rhadamanthus.

Greek deity (noun)	Aether (noun)
a deity worshipped by the ancient Greeks	personification of the sky or upper air breathed by the Olympians; son of Erebus and night or of Chaos and darkness