56 entries under extra topic. ×

0
over(adjective, reserve, replacement, unused)
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pseudo(auxiliary, supernumerary)
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sham(auxiliary, supernumerary)
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simulated(auxiliary, supernumerary)
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spurious(auxiliary, supernumerary)
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substitutive(adjective, reserve, subsidiary, auxiliary)
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supererogatory(adjective, reserve, replacement, unused)
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superfluous(adjective, reserve, replacement, unused)
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supernumerary(adjective, reserve, replacement, temporary)
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supposititious(auxiliary, supernumerary)
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surplus(adjective, reserve, replacement, unused)
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symbolic(auxiliary, supernumerary)
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unoccupied(adjective, reserve, replacement, unused)
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unused(adjective, reserve, replacement, standby)
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unwanted(adjective, reserve, replacement, unused)
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vicarial(adjective, reserve, subsidiary, auxiliary)
<123>
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APASmart Define. (2015). backup thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/backup/thesaurus/synonyms
ChicagoSmart Define. 2015. "backup thesaurus" https://smartdefine.org/backup/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, backup thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/backup/thesaurus/synonyms>.
MLASmart Define. "backup thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/backup/thesaurus/synonyms>