4
other(adjective, extraordinary, new, spare, fresh)
4
plus(adjective, extraordinary, new, spare, fresh)
4
spare(adjective, extraordinary, new, fresh, special)
4
superfluous(adjective, extraordinary, new, spare, fresh)
3
adjunct(noun, adjective, relational)
3
adjuvant(adjective, useful, minor, helpful, secondary)
3
another(adjective, extraordinary, new, spare, fresh)
3
appurtenant(adjective, useful, minor, helpful, secondary)
3
complemental(adjective, part, agree, complementary)
3
contributory(useful, minor, helpful, secondary, lesser)
3
extraneous(adjective, extraordinary, new, spare, fresh)
3
perk(adjective, extraordinary, new, spare, fresh)
3
standby(adjective, increase, extra, auxiliary, supernumerary)
3
unessential
2
accessorial
2
ascititious(addition, completeness)
2
assistant
2
attached(adjective, accompanying)
2
companion(adjective, accompanying)
2
completing
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APASmart Define. (2015). supplemental thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/supplemental/thesaurus/synonyms
ChicagoSmart Define. 2015. "supplemental thesaurus" https://smartdefine.org/supplemental/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, supplemental thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/supplemental/thesaurus/synonyms>.
MLASmart Define. "supplemental thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/supplemental/thesaurus/synonyms>