159 entries under noun topic. ×

19
addition(increase, delay, development, spread)
17
appendage(end, increase, delay, development)
14
addendum(increase, note, delay, development)
14
adjunct(help, increase, delay, development)
12
supplement(increase, delay, development, spread)
11
codicil(part, increase, extra, addition)
11
extension(increase, spread, extra, addition)
11
postscript(end, increase, note, extra)
10
suffix(sequel, add-on, affix)
8
accessory(adjective, part, extra, addition)
8
appurtenance(addition, document, accessory, attachment)
8
affix(addition, extension, add-on, addendum)
7
attachment(extra, addition, extension, document)
7
vermiform appendix(expression, idiom)
6
epilogue(addition, supplement, sequel, afterthought)
5
annex(increase, delay, development, spread)
5
rider(increase, extra, addition, document)
5
continuation(increase, delay, development, spread)
5
index(plan, list, document, summary)
4
sequel(increase, extra, addition, additive)
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APASmart Define. (2015). appendix thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/appendix/thesaurus/synonyms
ChicagoSmart Define. 2015. "appendix thesaurus" https://smartdefine.org/appendix/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, appendix thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/appendix/thesaurus/synonyms>.
MLASmart Define. "appendix thesaurus" 10 April 2015. Web. 20 September 2026. <https://smartdefine.org/appendix/thesaurus/synonyms>