1
arcade
1
arcature
1
arched roof
1
archway
1
assize(noun, law, regulation, order, test)
1
assumption(noun, support, action, base, beginning)
1
authority(noun, support, action, base, beginning)
1
axiom(noun, law, support, regulation, action)
1
axis
1
axle
1
axletree
1
background(noun, support, action, base, beginning)
1
backing(noun, support, action, base, beginning)
1
bench mark
1
bottom
1
brocard(noun, law, regulation, order, test)
1
call
1
camber
1
canon(noun, law, regulation, order, test)
1
catastrophe
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APASmart Define. (2015). keystone thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/keystone/thesaurus/synonyms
ChicagoSmart Define. 2015. "keystone thesaurus" https://smartdefine.org/keystone/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, keystone thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/keystone/thesaurus/synonyms>.
MLASmart Define. "keystone thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/keystone/thesaurus/synonyms>