posterior nasal aperture vs internal nostril

posterior nasal aperture and internal nostril both are nouns.

Word	Noun	Adjective	Verb	Adverb
posterior nasal aperture	Yes	No	No	No
internal nostril	Yes	No	No	No

As nouns, posterior nasal aperture and internal nostril are synonyms defined as:

posterior nasal aperture and internal nostril: either one of the two posterior openings at the back of the nasal cavity leading to the nasopharynx

Other synonyms of posterior nasal aperture include choana.

posterior nasal aperture (noun)	internal nostril (noun)
either one of the two posterior openings at the back of the nasal cavity leading to the nasopharynx	either one of the two posterior openings at the back of the nasal cavity leading to the nasopharynx