Base
Base noun - An immaterial thing upon which something else rests.
Underbelly and base are semantically related In some cases you can use "Underbelly" instead a noun "Base".
Underbelly
Underbelly noun - The side or part facing downward from something.
Usage example: the underbelly of the old submarine is in bad shape
Base and underbelly are semantically related in bottom topic. You can use "Base" instead a noun "Underbelly", if it concerns topics such as foundation.
Mutual synonyms
Cite this Source
Underbelly and Base. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/base/underbelly
Base & Underbelly. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/base/underbelly>.
Underbelly or Base. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/base/underbelly.
Google Ngram Viewer shows how "base" and "underbelly" have occurred on timeline