108 entries under addition topic. ×

18
adjunct(noun, drop, part, help, cover)
16
appendix(noun, end, increase, delay, development)
15
addendum(noun, increase, delay, development, spread)
15
extension(noun, part, increase, spread, extra)
14
appurtenance(noun, feature, part, increase, supply)
13
accessory(noun, feature, drop, part, cover)
12
attachment(noun, feature, increase, extra)
10
supplement(noun, part, increase, delay, development)
9
member(noun, branch, tail, arm)
8
accompaniment(noun, part, accessory, attachment)
8
auxiliary(noun, part, extra, extension)
8
extra(noun, part, increase, extension)
8
fixture(noun, feature, part, extra)
6
annex(noun, part, increase, delay, development)
6
extremity(noun, close, part, end, branch)
5
arm(noun, increase, delay, development, spread)
5
branch(noun, increase, delay, development, spread)
5
wing(noun, increase, delay, development, spread)
4
continuation(noun, increase, delay, development, spread)
4
increase(noun, delay, development, spread, extra)
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APASmart Define. (2015). appendage thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/appendage/thesaurus/synonyms
ChicagoSmart Define. 2015. "appendage thesaurus" https://smartdefine.org/appendage/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, appendage thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/appendage/thesaurus/synonyms>.
MLASmart Define. "appendage thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/appendage/thesaurus/synonyms>