Base
Both words in one sentence
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And, from the base, he can open a door in Moscow, so the agents can return to the base in the same way.
Source: Series / Los Únicos -
The HYDRA facilities in Captain America: The First Avenger are above ground and in the open, and their main base is dug into the Alps, and is implied to be 500 feet underground.
Source: Elaborate Underground Base - Additionally, the open-source movement provided a grassroots technological base to ordinary people, who in turn embraced some key open software.
Source: Analysis / Post-Cyberpunk
Cite this Source
Open and Base. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/base/open
Base & Open. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/base/open>.
Open or Base. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/base/open.
Google Ngram Viewer shows how "base" and "open" have occurred on timeline