cavities

noun
  1. 1

    A hole or hollow depression.

  2. 2

    A hollow area within the body (such as the sinuses).

  3. 3

    A small or large hole in a tooth caused by caries; often also a soft area adjacent to the hole also affected by caries.

Synonyms

Source: https://en.wiktionary.org/wiki/cavities, https://en.wiktionary.org/wiki/cavity