84 entries under extra topic. ×

14
substitute(noun, adjective, support, cover, ability)
11
auxiliary(noun, adjective, support, increase, lower)
11
backup(noun, adjective, support, increase, lower)
11
spare(noun, verb, adjective, support, keep)
8
alternate(noun, adjective, cover, lower, inferior)
5
alternative(spare, replacement, additional, alternate)
4
unused(adjective, extraordinary, new, spare, fresh)
3
emergency(adjective, increase, spare, replacement)
3
in store(expression, adjective, extraordinary, new, spare)
3
new(adjective, extraordinary, spare, fresh, special)
3
perk(adjective, extraordinary, new, spare, fresh)
3
provisional(auxiliary, supernumerary)
3
proxy(noun, replacement, alternative, alternate)
3
replacement(noun, adjective, cover, near)
3
standby(noun, adjective, increase, substitute)
2
additional(adjective, extraordinary, new, spare, fresh)
2
ancillary(adjective, support, extraordinary, new, spare)
2
counterfeit(auxiliary, supernumerary)
2
dummy(replacement, alternative, alternate, auxiliary)
2
ersatz(auxiliary, supernumerary)
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APASmart Define. (2015). reserve thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/reserve/thesaurus/synonyms
ChicagoSmart Define. 2015. "reserve thesaurus" https://smartdefine.org/reserve/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, reserve thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/reserve/thesaurus/synonyms>.
MLASmart Define. "reserve thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/reserve/thesaurus/synonyms>