| issue | |
| kernel | |
| keynote(noun, law, support, regulation, action) | |
| lynchpin | |
| root(noun, support, action, idea, base) | |
| rule(noun, law, regulation, behavior, standard) | |
| sine qua non(noun, expression, idiom, importance) | |
| wedge(noun, block, base, basis, segment) | |
| base(noun, support, action, beginning, source) | |
| crux(noun, support, action, idea, base) | |
| essential(noun, support, action, base, beginning) | |
| foundation stone(noun, expression, idiom, foundation) | |
| gravamen | |
| Key | |
| anchorman | |
| anchorperson | |
| bedrock(noun, support, action, base, beginning) | |
| cardinal point(expression, idiom, importance) | |
| cotter(noun, block, lump, segment, chunk) | |
| crown(noun, base) |
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| APA | Smart Define. (2015). keystone thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/keystone/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "keystone thesaurus" https://smartdefine.org/keystone/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, keystone thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/keystone/thesaurus/synonyms>. |
| MLA | Smart Define. "keystone thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/keystone/thesaurus/synonyms> |