- Definitions|1
- Thesaurus|314
- Abbreviations|0
| reinforcement(noun, extra, supplement, appendage) | |
| rider(noun, increase, extra, addition, supplement) | |
| ripper | |
| rise(noun, extra, supplement, appendage) | |
| sequel(noun, increase, extra, addition) | |
| something added(noun, expression, increase, extra, addition) | |
| something conjoined(expression, addition, supplement) | |
| something joined(noun, expression, extra, addition) | |
| spin-off(noun, increase, extra, addition) | |
| subordinate(noun, addition, attachment) | |
| subsidiary(noun, increase, extra, addition) | |
| suite | |
| supernumerary(noun, addition, supplement) | |
| supplementary(adjective, extra, additional) | |
| supplementation | |
| surcharge(noun, extra, supplement, appendage) | |
| system | |
| translator | |
| treat(noun, extra, addition, supplement) | |
| trim(noun, addition, decoration, fixture) |
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| APA | Smart Define. (2015). add-on thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/add-on/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "add-on thesaurus" https://smartdefine.org/add-on/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, add-on thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/add-on/thesaurus/synonyms>. |
| MLA | Smart Define. "add-on thesaurus" 22 December 2015. Web. 25 September 2026. <https://smartdefine.org/add-on/thesaurus/synonyms> |