Roman deity vs god

Roman deity and god both are nouns.

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

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

Roman deity: a deity worshipped by the ancient Romans
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 Roman deity include deity, divinity, immortal.

Roman deity (noun)	god (noun)
a deity worshipped by the ancient Romans	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