162 entries under noun topic. ×

22
addition(increase, delay, development, spread)
16
supplement(act, increase, delay, development)
14
extension(increase, spread, extra, addition)
13
adjunct(act, help, increase, delay)
13
appendix(increase, note, delay, development)
12
accessory(extra, addition, attachment, supplement)
11
appendage(increase, delay, development, spread)
11
augmentation(increase, delay, development, spread)
11
extra(increase, addition, accessory, attachment)
8
attachment(act, measure, extra, addition)
7
annex(increase, delay, development, spread)
7
codicil(act, part, increase, measure)
7
accretion
7
appurtenance(addition, attachment, supplement, accompaniment)
7
increment(increase, extra, addition, supplement)
6
accession(extra, supplement, appendage, annexation)
6
postscript(increase, note, extra, addition)
6
accompaniment(attachment, supplement, accompaniment, adjunct)
6
continuation(increase, delay, development, spread)
6
increase(delay, development, spread, extra)
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APASmart Define. (2015). addendum thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/addendum/thesaurus/synonyms
ChicagoSmart Define. 2015. "addendum thesaurus" https://smartdefine.org/addendum/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, addendum thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/addendum/thesaurus/synonyms>.
MLASmart Define. "addendum thesaurus" 13 April 2015. Web. 24 September 2026. <https://smartdefine.org/addendum/thesaurus/synonyms>