56 entries under supplement topic. ×

22
addition(noun, increase, delay, development, spread)
14
extension(noun, increase, spread, extra, addition)
13
adjunct(noun, act, help, increase, delay)
13
appendix(noun, increase, note, delay, development)
12
accessory(noun, extra, addition, attachment)
11
appendage(noun, increase, delay, development, spread)
11
augmentation(noun, increase, delay, development, spread)
11
extra(noun, increase, addition, accessory, attachment)
8
attachment(noun, act, measure, extra, addition)
7
annex(noun, increase, delay, development, spread)
7
codicil(noun, act, part, increase, measure)
7
appurtenance(noun, addition, attachment, accompaniment)
7
increment(noun, increase, extra, addition)
6
accession(noun, extra, appendage, annexation)
6
postscript(noun, increase, note, extra, addition)
6
accompaniment(noun, attachment, accompaniment, adjunct)
6
increase(noun, delay, development, spread, extra)
5
insert(noun, increase, extra, addition)
4
complement(noun, increase, extra, addition, attachment)
4
rider(noun, act, increase, measure, extra)
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APASmart Define. (2015). addendum thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/addendum/thesaurus/synonyms
ChicagoSmart Define. 2015. "addendum thesaurus" https://smartdefine.org/addendum/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, addendum thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/addendum/thesaurus/synonyms>.
MLASmart Define. "addendum thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/addendum/thesaurus/synonyms>