Greek deity vs Grace

Greek deity and Grace both are nouns.

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

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

Greek deity: a deity worshipped by the ancient Greeks
Grace: (Greek mythology) one of three sisters who were the givers of beauty and charm; a favorite subject for sculptors

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

Greek deity (noun)	Grace (noun)
a deity worshipped by the ancient Greeks	(Greek mythology) one of three sisters who were the givers of beauty and charm; a favorite subject for sculptors