Cavity
Cavity noun - A sunken area forming a separate space.
Underground chamber and cavity are semantically related In some cases you can use "Underground chamber" instead a noun "Cavity".
Underground chamber
Cavity and underground chamber are semantically related in cave topic. You can use "Cavity" instead a noun phrase "Underground chamber".
Cite this Source
Underground chamber and Cavity. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/cavity/underground_chamber
Cavity & Underground chamber. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/cavity/underground_chamber>.
Underground chamber or Cavity. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/cavity/underground_chamber.
Google Ngram Viewer shows how "cavity" and "underground chamber" have occurred on timeline