Beneath
Beneath adverb - In or to a lower place.
Underground and beneath are semantically related. In some cases you can use "Underground" instead an adjective "Beneath".
Underground
Underground adjective - Undertaken or done so as to escape being observed or known by others.
Beneath and underground are semantically related. Sometimes you can use "Beneath" instead an adjective "Underground".
Mutual synonyms
Both words in one sentence
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Yes, the game has an example of an underground base beneath another underground base.
Source: Elaborate Underground Base -
Meat Moss: A feature of the underground tunnels beneath the surface, and evidence of the "evil beneath the city" the old man envisions in the opening cut-scene.
Source: Video Game / Beneath a Steel Sky - Underground Level: The caverns beneath the Ivlis, and the lesser and greater catacombs beneath Barovia.
Cite this Source
Underground and Beneath. (2016). Retrieved 2026, July 29, from https://thesaurus.plus/related/beneath/underground
Beneath & Underground. N.p., 2016. Web. 29 Jul. 2026. <https://thesaurus.plus/related/beneath/underground>.
Underground or Beneath. 2016. Accessed July 29, 2026. https://thesaurus.plus/related/beneath/underground.
Google Ngram Viewer shows how "beneath" and "underground" have occurred on timeline