141 entries under noun topic. ×
| foundation(base, beginning, source, essential) | |
| mainstay(support, base, essential, foundation) | |
| cornerstone(idea, base, element, foundation) | |
| backbone(support, action, base, beginning) | |
| basis(law, regulation, action, idea) | |
| headstone(base, gravestone) | |
| principle(support, action, idea, base) | |
| anchor(essential, foundation, kingpin, fulcrum) | |
| core(support, action, idea, base) | |
| linchpin(idea, essential, foundation, essence) | |
| essence(support, action, idea, base) | |
| fundamental(law, support, regulation, action) | |
| gist | |
| ground(foundation, motive, reinforcement) | |
| heart(support, action, idea, base) | |
| key | |
| quoin(block, lump, segment, chunk) | |
| support(action, base, beginning, source) | |
| groundwork(foundation, reinforcement) | |
| keynote(law, support, regulation, action) |
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| APA | Smart Define. (2015). keystone thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/keystone/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "keystone thesaurus" https://smartdefine.org/keystone/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, keystone thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/keystone/thesaurus/synonyms>. |
| MLA | Smart Define. "keystone thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/keystone/thesaurus/synonyms> |