19
supplementary(adjective, increase, extraordinary, new, spare)
17
auxiliary(adjective, increase, extraordinary, new, spare)
16
additional(adjective, extraordinary, new, spare, fresh)
15
extra(adjective, spare, excess, addition, further)
14
subsidiary(noun, adjective, useful, minor, helpful)
12
accessory(adjective, useful, minor, addition, helpful)
12
secondary(adjective, increase, useful, minor, helpful)
11
ancillary(adjective, extraordinary, new, spare, fresh)
7
adventitious
6
added(adjective, extraordinary, new, spare, fresh)
6
adscititious(adjective, addition, additional)
6
further(adjective, extraordinary, new, spare, fresh)
5
collateral(adjective, useful, minor, helpful, secondary)
5
fresh(adjective, extraordinary, new, spare, special)
5
new(adjective, extraordinary, spare, fresh, special)
5
subordinate(adjective, useful, minor, helpful, secondary)
5
substitute(adjective, extra, alternative, auxiliary, supernumerary)
4
additive(adjective, addition)
4
complementary(adjective, part, agree)
4
more(adjective, adverb, extraordinary, new, spare)
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APASmart Define. (2015). supplemental thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/supplemental/thesaurus/synonyms
ChicagoSmart Define. 2015. "supplemental thesaurus" https://smartdefine.org/supplemental/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, supplemental thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/supplemental/thesaurus/synonyms>.
MLASmart Define. "supplemental thesaurus" 10 April 2015. Web. 21 September 2026. <https://smartdefine.org/supplemental/thesaurus/synonyms>