choana vs naris

choana and naris both are nouns.

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

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

choana: either one of the two posterior openings at the back of the nasal cavity leading to the nasopharynx
naris: any of the openings to the nasal cavities that allow air to flow through the cavities to the pharynx

choana (noun)	naris (noun)
either one of the two posterior openings at the back of the nasal cavity leading to the nasopharynx	any of the openings to the nasal cavities that allow air to flow through the cavities to the pharynx