Roman deity vs faun

Roman deity and faun both are nouns.

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

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

Roman deity: a deity worshipped by the ancient Romans
faun: ancient Italian deity in human shape, with horns, pointed ears and a goat's tail; equivalent to Greek satyr

Other hyponyms of Roman deity include Parcae.

Roman deity (noun)	faun (noun)
a deity worshipped by the ancient Romans	ancient Italian deity in human shape, with horns, pointed ears and a goat's tail; equivalent to Greek satyr