naris vs orifice

naris and orifice both are nouns.

Word	Noun	Adjective	Verb	Adverb
naris	Yes	No	No	No
orifice	Yes	No	No	No

As nouns, orifice is a hypernym of naris; that is, orifice is a word with a broader meaning than naris:

naris: any of the openings to the nasal cavities that allow air to flow through the cavities to the pharynx
orifice: an aperture or hole that opens into a bodily cavity

Other hypernyms of naris include opening, porta.

naris (noun)	orifice (noun)
any of the openings to the nasal cavities that allow air to flow through the cavities to the pharynx	an aperture or hole that opens into a bodily cavity