Cavum and Nasal cavity

Cavum noun - (anatomy) a natural hollow or sinus within the body.

Nasal cavity and cavum are semantically related. In some cases you can replace phrase "Nasal cavity" with "Cavum", 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.

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