70 entries under addition topic. ×

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fitment(noun, decoration, fixture)
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fitting(noun, extra)
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fixture(noun, extra, decoration)
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frill(noun, extra, attachment, decoration)
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help(noun, decoration, fixture)
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increase(noun, extra, supplement, appendage)
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increment(noun, increase, extra, supplement)
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insert(noun, increase, extra)
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insertion(noun, increase, extra)
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limb accessory(expression, attachment)
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member(noun, attachment)
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option(noun, increase, extra, supplement)
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optional extra(noun, expression, extra, attachment)
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part(noun, extra)
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partner(noun, attachment)
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projection(noun, attachment)
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protuberance(noun, attachment)
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pullout(noun, increase, extra)
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rider(noun, increase, extra, supplement)
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sequel(noun, increase, extra)
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APASmart Define. (2015). add-on thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/add-on/thesaurus/synonyms
ChicagoSmart Define. 2015. "add-on thesaurus" https://smartdefine.org/add-on/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, add-on thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/add-on/thesaurus/synonyms>.
MLASmart Define. "add-on thesaurus" 22 December 2015. Web. 28 September 2026. <https://smartdefine.org/add-on/thesaurus/synonyms>