| under(adjective, low, minor, side, secondary) | |
| underaverage(adjective, lower, low, inferior, subject) | |
| undergirding | |
| unequal(adjective, low, inferior, subject, minor) | |
| useful(adjective, minor, helpful, secondary, lesser) | |
| vasodilator | |
| vitamin | |
| wave maker(noun, expression, spur, goad, incentive) | |
| abetting(adjective, support, spare, auxiliary, supplementary) | |
| accessorial | |
| added(adjective, side, secondary, indirect, ancillary) | |
| admixture | |
| affiliated | |
| affix | |
| aide-de-camp | |
| akin(adjective, collateral, attendant, kindred, congeneric) | |
| allied(adjective, collateral, attendant, kindred, congeneric) | |
| alloy | |
| ally | |
| alternate(adjective, subject, reserve, collateral, subsidiary) |
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| APA | Smart Define. (2015). adjuvant thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/adjuvant/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "adjuvant thesaurus" https://smartdefine.org/adjuvant/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, adjuvant thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/adjuvant/thesaurus/synonyms>. |
| MLA | Smart Define. "adjuvant thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/adjuvant/thesaurus/synonyms> |