11
confirming(verb, adjective, checking, evincing, proving)
9
validating(verb, adjective, checking, evincing, proving)
8
verifying(verb, adjective, checking, proving, confirming)
7
confirmatory
7
corroborative
6
collateral
6
confirmative
6
corroboratory
6
demonstrating(verb, evincing, confirming, ascertaining)
6
establishing(noun, verb, evincing, confirming, ascertaining)
6
substantiative
6
supporting(verb, evincing)
6
validatory
5
corroborating(verb, adjective, checking, evincing, proving)
5
verificatory
4
ascertaining(verb, ascertaining)
4
attesting(verb, evincing)
4
authenticating(verb, checking, evincing, proving, confirming)
4
proving(verb, checking, evincing, confirming, ascertaining)
3
certifying(verb, evincing, ascertaining)
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APASmart Define. (2015). substantiating thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/substantiating/thesaurus/synonyms
ChicagoSmart Define. 2015. "substantiating thesaurus" https://smartdefine.org/substantiating/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, substantiating thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/substantiating/thesaurus/synonyms>.
MLASmart Define. "substantiating thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/substantiating/thesaurus/synonyms>