104 entries under addition topic. ×

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codicil(noun, increase, supplement, additive)
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continuation(noun, increase, additive)
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cum multis aliis(expression, idiom)
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enhancement(noun, increase, complement, supplement)
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extremity(noun, attachment)
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fitment(noun, decoration, fixture)
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help(noun, decoration, fixture)
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insert(noun, increase, additive)
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insertion(noun, increase)
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limb accessory(expression, attachment)
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optional extra(noun, expression, attachment, supplement)
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postscript(noun, increase, supplement, additive)
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projection(noun, attachment)
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protuberance(noun, attachment)
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pullout(noun, increase, additive)
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review(noun, press, regular, community)
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rider(noun, increase, supplement, additive)
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sequel(noun, increase, derivative, offshoot)
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something added(noun, expression, increase, additive)
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something conjoined(expression, supplement)
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APASmart Define. (2016). extra thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/extra/thesaurus/synonyms
ChicagoSmart Define. 2016. "extra thesaurus" https://smartdefine.org/extra/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, extra thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/extra/thesaurus/synonyms>.
MLASmart Define. "extra thesaurus" 30 March 2016. Web. 24 September 2026. <https://smartdefine.org/extra/thesaurus/synonyms>