3
surplus(adjective, extraordinary, new, spare, fresh)
2
additive
2
adjuvant(adjective, support, low, inferior, subject)
2
also(adverb, new, extra, additional, greater)
2
assisting(adjective, support, minor, helpful, secondary)
2
backup(noun, adjective, support, increase, counterfeit)
2
deserve
2
excess
2
farther(adjective, new, extra, replacement, additional)
2
increased(adjective, new, extra, positive, replacement)
2
inessential(adjective, extraordinary, new, spare, fresh)
2
inferior(adjective, low, minor, secondary, subsidiary)
2
lesser(adjective, low, minor, helpful, secondary)
2
lower(adjective, low, minor, secondary, lesser)
2
nonessential(extra, secondary, subsidiary, related, irrelevant)
2
occasional
2
optional(adjective, extraordinary, new, spare, fresh)
2
reserve(adjective, support, increase, extraordinary, new)
2
superfluous(adjective, extraordinary, new, spare, fresh)
2
supervenient
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APASmart Define. (2016). supplementary thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/supplementary/thesaurus/synonyms
ChicagoSmart Define. 2016. "supplementary thesaurus" https://smartdefine.org/supplementary/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, supplementary thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/supplementary/thesaurus/synonyms>.
MLASmart Define. "supplementary thesaurus" 19 February 2016. Web. 25 September 2026. <https://smartdefine.org/supplementary/thesaurus/synonyms>