4
sequel(noun, increase, extra, addition, additive)
3
augmentation(noun, increase, delay, development, spread)
3
cecal appendage(noun, expression, idiom)
3
afterthought(noun, addition, supplement)
3
auxiliary(noun, adjective, addition, attachment, decoration)
3
enlargement(noun, increase, delay, development, extra)
3
extra(noun, adjective, increase, addition, attachment)
3
increase(noun, delay, development, spread, extra)
3
table(noun, document, diagram)
3
vermiform process(noun, expression, idiom)
2
accession(noun, extra, supplement, appendage, add-on)
2
accompaniment(noun, addition, decoration, accompaniment, fixture)
2
adornment(noun, addition, decoration, accompaniment, fixture)
2
annexe
2
back matter(noun, document)
2
cecum
2
colophon
2
companion(noun, accompaniment)
2
conclusion(noun, end, finale, coda, finial)
2
duodenum
11 years ago|7.2k views|share |citing 
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>