| side(secondary, indirect, ancillary) | |
| surrogate(noun, copy, supply, extra, agent) | |
| verb | |
| abettor(noun, help, associate, supporter, subordinate) | |
| accessary | |
| accompanying(adjective, extra, subordinate, additional, secondary) | |
| added(adjective, extraordinary, new, spare, fresh) | |
| adornment(noun, addition, decoration, accompaniment, fixture) | |
| adscititious | |
| alter ego | |
| alternative(new, extra, replacement, additional, alternate) | |
| assistance | |
| auxiliary verb(expression, idiom) | |
| benefactor(noun, assistant, benefactor) | |
| casual | |
| coincident(adjective, secondary, subsidiary, indirect, supplementary) | |
| complement(noun, verb, addition, accessory, attachment) | |
| comrade(noun, associate, companion, friend, partner) | |
| concomitant(noun, adjective, subordinate, collateral, secondary) | |
| consort(noun, companion, friend, partner, ally) |
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| APA | Smart Define. (2015). auxiliary thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/auxiliary/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "auxiliary thesaurus" https://smartdefine.org/auxiliary/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, auxiliary thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/auxiliary/thesaurus/synonyms>. |
| MLA | Smart Define. "auxiliary thesaurus" 22 December 2015. Web. 26 September 2026. <https://smartdefine.org/auxiliary/thesaurus/synonyms> |