4
bear
4
clear(verb, support, maintain, favor, sustain)
4
defend(verb, support, hold, help, maintain)
4
determine(verb, ascertain, evince)
4
externalise
4
maintain(verb, support, hold, help, favor)
4
reinforce(verb, support, increase, establish, extend)
4
sanction(noun, verb, support, back, sign)
4
settle(verb, support, show, determine, back)
4
try out(verb, expression, phrasal verb, check, examine)
4
vouch for(verb, expression, show, confirm, prove)
3
accomplish
3
ascertain(verb, ascertain)
3
assay(verb, check, show, determine, examine)
3
assure(verb, support, maintain, back, declare)
3
attest to(verb, expression, phrasal verb, support, maintain)
3
check out(verb, expression, phrasal verb, support, back)
3
circumstantiate(verb, support, determine, back, sign)
3
claim(support, maintain, favor, defend, uphold)
3
clinch(verb, verify, ensure)
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APASmart Define. (2015). substantiate thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/substantiate/thesaurus/synonyms
ChicagoSmart Define. 2015. "substantiate thesaurus" https://smartdefine.org/substantiate/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, substantiate thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/substantiate/thesaurus/synonyms>.
MLASmart Define. "substantiate thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/substantiate/thesaurus/synonyms>