Cavity and Nasal cavity

Cavity noun - A sunken area forming a separate space.

Nasal cavity and cavity are semantically related. In some cases you can replace phrase "Nasal cavity" with "Cavity", this terms are similar.

Nasal cavity noun - Either of the two cavities lying between the floor of the cranium and the roof of the mouth and extending from the face to the pharynx.

Cavity and nasal cavity are semantically related. You can use "Cavity" instead a noun phrase "Nasal cavity".