| concomitant(adjective, subject, subordinate, contemporary, additional) | |
| confirmatory(adjective, lower, subject, subordinate, secondary) | |
| corroborative(adjective, secondary, subsidiary, indirect, ancillary) | |
| corroboratory | |
| assurance(noun, agreement, contract, counter, promise) | |
| circuitous(adjective, ambiguous, secondary, rambling, around) | |
| coincident(adjective, like, parallel, joint, subordinate) | |
| concurrent(adjective, contemporary, secondary, connected, indirect) | |
| confirmative | |
| confirming | |
| guaranty(noun, agreement, contract, counter, assurance) | |
| insurance(noun, care, agreement, contract, assurance) | |
| lateral(adjective, secondary, indirect, ancillary, laterality) | |
| promise(noun, care, agreement, contract, assurance) | |
| simultaneous | |
| substantiating | |
| substantiative | |
| supporting(adjective, inferior, insignificant, minor, secondary) | |
| validatory | |
| adjuvant(adjective, lower, low, spare, inferior) |
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| APA | Smart Define. (2015). collateral thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/collateral/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "collateral thesaurus" https://smartdefine.org/collateral/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, collateral thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/collateral/thesaurus/synonyms>. |
| MLA | Smart Define. "collateral thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/collateral/thesaurus/synonyms> |