Compartment and Cavity

Compartment noun - One of the parts into which an enclosed space is divided.

Cavity is a synonym for compartment in section topic. In some cases you can use "Cavity" instead a noun "Compartment", when it comes to topics like cell, container.

Cavity noun - A sunken area forming a separate space.

Compartment is a synonym for cavity in cell topic. You can use "Compartment" instead a noun "Cavity", if it concerns topics such as container.