1. pit, cavity, hole, hollow

usage: a sizeable hole (usually in the ground); "they dug a pit to bury the body"

2. cavity, enclosed space, space

usage: space that is surrounded by something

3. cavity, caries, dental caries, tooth decay, decay

usage: soft decayed area in a tooth; progressive decay can lead to the death of a tooth

4. cavity, bodily cavity, cavum, structure, anatomical structure, complex body part, bodily structure, body structure

usage: (anatomy) a natural hollow or sinus within the body

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See also: cavity (Dictionary)