| arcade | |
| arcature | |
| arched roof | |
| archway | |
| assize(noun, law, regulation, order, test) | |
| assumption(noun, support, action, base, beginning) | |
| authority(noun, support, action, base, beginning) | |
| axiom(noun, law, support, regulation, action) | |
| axis | |
| axle | |
| axletree | |
| background(noun, support, action, base, beginning) | |
| backing(noun, support, action, base, beginning) | |
| bench mark | |
| bottom | |
| brocard(noun, law, regulation, order, test) | |
| call | |
| camber | |
| canon(noun, law, regulation, order, test) | |
| catastrophe |
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| APA | Smart Define. (2015). keystone thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/keystone/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "keystone thesaurus" https://smartdefine.org/keystone/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, keystone thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/keystone/thesaurus/synonyms>. |
| MLA | Smart Define. "keystone thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/keystone/thesaurus/synonyms> |