Underground tunnel
Vault and underground tunnel are semantically related. In some cases you can use "Vault" instead a noun phrase "Underground tunnel".
Vault
Vault noun - An underground burial chamber.
Underground tunnel and vault are semantically related. You can use "Underground tunnel" instead a noun "Vault".
Both terms in one sentence
-
Barney and Willie use an underground tunnel to enter a monastery, but a cave-in traps them in front of a vault door that must be opened from the inside.
Source: Buried Alive
Cite this Source
Vault and Underground tunnel. (2016). Retrieved 2026, August 08, from https://thesaurus.plus/related/underground_tunnel/vault
Underground tunnel & Vault. N.p., 2016. Web. 08 Aug. 2026. <https://thesaurus.plus/related/underground_tunnel/vault>.
Vault or Underground tunnel. 2016. Accessed August 08, 2026. https://thesaurus.plus/related/underground_tunnel/vault.
Google Ngram Viewer shows how "underground tunnel" and "vault" have occurred on timeline