nostril vs anterior naris

nostril and anterior naris both are nouns.

Word	Noun	Adjective	Verb	Adverb
nostril	Yes	No	No	No
anterior naris	Yes	No	No	No

As nouns, nostril and anterior naris are synonyms defined as:

nostril and anterior naris: either one of the two external openings to the nasal cavity in the nose

nostril (noun)	anterior naris (noun)
either one of the two external openings to the nasal cavity in the nose	either one of the two external openings to the nasal cavity in the nose