Celtic deity vs god

Celtic deity and god both are nouns.

Word	Noun	Adjective	Verb	Adverb
Celtic deity	Yes	No	No	No
god	Yes	No	No	No

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

Celtic deity: a deity worshipped by the Celts
god: 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 Celtic deity include deity, divinity, immortal.

Celtic deity (noun)	god (noun)
a deity worshipped by the Celts	a material effigy that is worshipped
	any supernatural being worshipped as controlling some part of the world or some aspect of life or who is the personification of a force
	a man of such superior qualities that he seems like a deity to other people