| accumulation | |
| add-on(noun, increase, extra, addition, attachment) | |
| addend | |
| additory | |
| adjuvant | |
| adornment(noun, accompaniment) | |
| affixture | |
| amalgamation(noun, augmentation) | |
| amplification(noun, increase, delay, development, spread) | |
| annexation | |
| appanage | |
| appendant | |
| appendices | |
| appurtenant | |
| arm(noun, increase, delay, development, spread) | |
| bonus(noun, extra, addition, supplement, appendage) | |
| book | |
| branch(noun, increase, delay, development, spread) | |
| broadening(noun, increase, delay, development, spread) | |
| brother(noun, accompaniment) |
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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> |