10
justify(verb, support, hold, help, show)
10
personify(verb, show, character, establish, express)
9
endorse(verb, support, hold, help, show)
9
externalize(verb, show, character, establish, declare)
9
uphold(verb, support, hold, help, show)
9
vouch(verb, support, give, back, sign)
9
warrant(verb, support, show, maintain, determine)
8
actualize(verb, express, idea, realize, prove)
8
document(verb, show, determine, confirm, explain)
8
realize(verb, express, idea, prove, appear)
8
testify(verb, support, show, maintain, back)
7
make good(verb, expression, idiom, support, favor)
7
materialize(verb, character, idea, prove, represent)
7
strengthen(verb, encourage, confirm, powerful, story)
6
assert(verb, support, show, maintain, favor)
6
back up(verb, expression, phrasal verb, support, help)
6
buttress(verb, support, increase, present, establish)
6
check(verb, support, show, determine, back)
6
evidence(noun, verb, support, show, determine)
6
exteriorize(verb, show, character, establish, declare)
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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>