Cornerstone
Cornerstone noun - An immaterial thing upon which something else rests.
Usage example: a concern for basic human rights was the cornerstone of the president's foreign policy
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Synonyms for Cornerstone
Keystone is a synonym for cornerstone in foundation topic. In some cases you can use "Keystone" instead a noun "Cornerstone", when it comes to topics like vital element. popular alternative
Keystone
Keystone noun - An immaterial thing upon which something else rests.
Usage example: a committed socialist who argues that greed is the keystone of capitalism
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Synonyms for Keystone
Cornerstone is a synonym for keystone in basis topic. You can use "Cornerstone" instead a noun "Keystone", if it concerns topics such as base, foundation. popular alternative
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Keystone and Cornerstone. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/cornerstone/keystone
Cornerstone & Keystone. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/cornerstone/keystone>.
Keystone or Cornerstone. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/cornerstone/keystone.
Google Ngram Viewer shows how "cornerstone" and "keystone" have occurred on timeline