| theorem(noun, support, action, base, beginning) | |
| theory(noun, support, action, base, beginning) | |
| tombstone | |
| topping | |
| truism(noun, law, regulation, order, test) | |
| turning point | |
| underpinning(noun, support, action, base, beginning) | |
| upshot | |
| vault | |
| vaulting | |
| vital element(expression, essential, foundation, kingpin, fulcrum) | |
| voussoir | |
| warp | |
| warrant(noun, support, action, base, beginning) | |
| winder | |
| winding up(verb, phrasal verb, completion) | |
| work done(expression, idiom, completion) | |
| anchorwoman | |
| angle | |
| armature |
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| APA | Smart Define. (2015). keystone thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/keystone/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "keystone thesaurus" https://smartdefine.org/keystone/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, keystone thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/keystone/thesaurus/synonyms>. |
| MLA | Smart Define. "keystone thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/keystone/thesaurus/synonyms> |