1
advocate(support, maintain, defend, uphold, explain)
1
advocate belief(verb, expression, hold, help, maintain)
1
agree with(verb, expression, hold, help, maintain)
1
aid(verb, hold, help, maintain, establish)
1
alibi(verb, support, favor, sustain, confirm)
1
anatomize
1
anneal(verb, support, increase, establish, extend)
1
answer for(expression, support, back, confirm, legitimize)
1
apologize for(expression, support, favor, defend, legitimize)
1
appear(realize, happen, swear, arrive, testify)
1
argue(show, maintain, confirm, defend, uphold)
1
argue for(verb, expression, support, favor, sustain)
1
arrogate
1
ascend(verb, support, increase, establish, extend)
1
assess(verb, check, examine, try, confirm)
1
assist(verb, hold, help, maintain, establish)
1
assume
1
atomise
1
atomize
1
audit(verb, ascertain)
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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>