51 entries under extension topic. ×

18
addition(noun, part, increase, delay, development)
18
adjunct(noun, drop, part, help, cover)
16
appendix(noun, end, increase, delay, development)
15
addendum(noun, increase, delay, development, spread)
14
appurtenance(noun, feature, part, increase, supply)
13
accessory(noun, feature, drop, part, cover)
10
supplement(noun, part, increase, delay, development)
8
auxiliary(noun, part, extra, addition)
8
extra(noun, part, increase, addition)
8
fixture(noun, feature, part, extra, addition)
6
annex(noun, part, increase, delay, development)
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)
3
augmentation(noun, increase, delay, development, spread)
2
accoutrement(noun, part, extra, addition)
2
part(noun, end, extra, branch, addition)
1
adapter(noun, part)
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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>