| affix(noun, addition, extension, supplement, adjunct) | |
| afterthought(noun, addition, supplement) | |
| afterword(noun, supplement) | |
| augment | |
| back matter(noun, document) | |
| boost(noun, extra, supplement, appendage, add-on) | |
| companion(noun, accompaniment) | |
| concomitant | |
| enclosure(noun, supplement) | |
| enhancement(noun, increase, extra, addition, supplement) | |
| expansion(noun, increase, delay, development, spread) | |
| gain(noun, extra, supplement, appendage, add-on) | |
| garnish(noun, accompaniment, adjunct) | |
| raise(noun, extra, supplement, appendage, add-on) | |
| rise(noun, extra, supplement, appendage, add-on) | |
| side note | |
| subscript(noun, sequel) | |
| subsidiary(noun, increase, extra, addition, extension) | |
| accident | |
| accidental |
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| APA | Smart Define. (2015). addendum thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/addendum/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "addendum thesaurus" https://smartdefine.org/addendum/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, addendum thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/addendum/thesaurus/synonyms>. |
| MLA | Smart Define. "addendum thesaurus" 13 April 2015. Web. 21 September 2026. <https://smartdefine.org/addendum/thesaurus/synonyms> |