Greek deity vs deity

Greek deity and deity both are nouns.

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

As nouns, deity is a hypernym of Greek deity; that is, deity is a word with a broader meaning than Greek deity:

Greek deity: a deity worshipped by the ancient Greeks
deity: any supernatural being worshipped as controlling some part of the world or some aspect of life or who is the personification of a force

Other hypernyms of Greek deity include divinity, god, immortal.

Greek deity (noun)	deity (noun)
a deity worshipped by the ancient Greeks	any supernatural being worshipped as controlling some part of the world or some aspect of life or who is the personification of a force