| relief(noun, reserve, substitute, replacement, alternate) | |
| stand in(verb, expression, phrasal verb) | |
| sub(noun, cover, reserve, substitute, replacement) | |
| supernumerary(adjective, extra, substitute, replacement, temporary) | |
| surrogate(noun, supply, extra, agent, substitute) | |
| sustainer(support, prop, pillar, backbone, bulwark) | |
| temporary(noun, reserve, extra, substitute, replacement) | |
| upholder(support, prop, pillar, backbone, bulwark) | |
| well-wisher(noun, luxuriance, overdose, redundance) | |
| abetter | |
| abettor | |
| additional(adjective, spare, extra, replacement, temporary) | |
| admirer | |
| advocate | |
| aficionado | |
| agent(supply, replacement, alternative, alternate, backup) | |
| alacrity | |
| anchor(support, prop, pillar, backbone) | |
| angel | |
| artificial(adjective, extra, auxiliary, supernumerary) |
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| APA | Smart Define. (2015). standby thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/standby/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "standby thesaurus" https://smartdefine.org/standby/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, standby thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/standby/thesaurus/synonyms>. |
| MLA | Smart Define. "standby thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/standby/thesaurus/synonyms> |