What is the difference between a nose and a nostril?

A nose is a part of the body used for breathing and smelling.

A nostril is the opening or openings (the hole or holes) of the nose.

Nose with two nostrils (breathing holes)

Nostrils (breathing holes) on the cere 

Photographer: Martina Nicolls

Martina Nicolls: SIMILAR BUT DIFFERENT IN THE ANIMAL KINGDOM