61 entries under extra topic. ×
| substitute(noun, cover, reserve, alternative) | |
| alternate(cover, supply, reserve, replacement) | |
| backup(noun, adjective, increase, reserve) | |
| replacement(noun, adjective, spare, reserve) | |
| reserve(noun, adjective, increase, substitute) | |
| auxiliary(noun, adjective, increase, spare, supply) | |
| emergency(noun, adjective, increase, spare, reserve) | |
| second(substitute, replacement, auxiliary, supernumerary) | |
| spare(noun, adjective, reserve, replacement) | |
| supplemental(adjective, increase, auxiliary, supernumerary) | |
| supplementary(adjective, increase, auxiliary, supernumerary) | |
| ancillary(adjective, substitute, auxiliary, supernumerary) | |
| supernumerary(adjective, substitute, replacement, temporary) | |
| surrogate(noun, supply, agent, substitute) | |
| temporary(noun, reserve, substitute, replacement) | |
| additional(adjective, spare, replacement, temporary) | |
| artificial(adjective, auxiliary, supernumerary) | |
| dummy(supply, agent, replacement, alternate) | |
| makeshift(supply, agent, replacement, alternate) | |
| odd(adjective, replacement) |
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| APA | Smart Define. (2015). standby thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/standby/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "standby thesaurus" https://smartdefine.org/standby/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, standby thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/standby/thesaurus/synonyms>. |
| MLA | Smart Define. "standby thesaurus" 13 April 2015. Web. 22 September 2026. <https://smartdefine.org/standby/thesaurus/synonyms> |