70 entries under addition topic. ×

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afterthought
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ancillary(noun, adjective, extra, additional)
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annex(noun, increase, extra, attachment)
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appliance(noun, decoration, fixture)
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associate(noun, attachment)
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augmentation(noun, extra, supplement, appendage)
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auxiliary(noun, adjective, extra, additional)
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bell(noun, increase, extra)
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bells and whistles(noun, expression, idiom, increase, extra)
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bonus(noun, extra, supplement, appendage)
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codicil(noun, increase, extra, supplement)
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complement(noun, increase, extra, attachment)
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component(noun, decoration, fixture)
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continuation(noun, increase, extra)
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decoration(noun, fixture)
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detail(noun, attachment)
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embellishment(noun, extra, decoration, fixture)
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enhancement(noun, increase, extra, supplement)
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extravagance(noun, extra, supplement)
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extremity(noun, attachment)
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APASmart Define. (2015). add-on thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/add-on/thesaurus/synonyms
ChicagoSmart Define. 2015. "add-on thesaurus" https://smartdefine.org/add-on/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, add-on thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/add-on/thesaurus/synonyms>.
MLASmart Define. "add-on thesaurus" 22 December 2015. Web. 27 September 2026. <https://smartdefine.org/add-on/thesaurus/synonyms>