Base
Base noun - An immaterial thing upon which something else rests.
Usage example: the firm belief that complete trust between husband and wife is the base of any successful marriage
Underpinning is a synonym for base in foundation topic. In some cases you can use "Underpinning" instead a noun "Base", when it comes to topics like reason, over, fundamental part.
Underpinning
Underpinning noun - An immaterial thing upon which something else rests.
Usage example: the underpinnings of the theory have recently been called into question
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Synonyms for Underpinning
Base is a synonym for underpinning in basis topic. You can use "Base" instead a noun "Underpinning", if it concerns topics such as reason, foundation, over, supporting structure.
Nearby Words: underpin, underpinned
Mutual synonyms
Cite this Source
Underpinning and Base. (2016). Retrieved 2026, August 16, from https://thesaurus.plus/related/base/underpinning
Base & Underpinning. N.p., 2016. Web. 16 Aug. 2026. <https://thesaurus.plus/related/base/underpinning>.
Underpinning or Base. 2016. Accessed August 16, 2026. https://thesaurus.plus/related/base/underpinning.
Google Ngram Viewer shows how "base" and "underpinning" have occurred on timeline