Nostrils
External nares ( Nostrils) are the openings formed by the external nose that open into the nasal cavity.
Nares are the external openings of the nose (human, animal, or reptile). These are also known as nostrils or the nasal passages.
Rhinarium is the naked skin surrounding the external openings of the nostrils, for example, the bare nose on cats and dogs.
Blocked nose
The nostrils / nares are the openings in the nose.
The openings in your nose are the nostrils.
Otolaryngology is the medical term meaning study of the ears, nose and throat.
Nasolacrimal is the medical term meaning pertaining to the nose and tear ducts.
The nasopharynx is the space behind the nose.
Nostril
Nasopharyngeal means pertaining to the nose and throat.