67 entries under extra topic. ×

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additional(adjective, supplementary)
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aggrandizement(noun, supplement, appendage)
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ancillary(noun, adjective, addition, additional)
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annex(noun, increase, addition, attachment)
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augmentation(noun, addition, supplement, appendage)
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auxiliary(noun, adjective, addition, additional)
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bell(noun, increase, addition)
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bells and whistles(noun, expression, idiom, increase)
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bonus(noun, addition, supplement, appendage)
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boost(noun, supplement, appendage)
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codicil(noun, increase, addition, supplement)
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commission(noun, supplement, appendage)
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complement(noun, increase, addition, attachment)
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continuation(noun, increase, addition)
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dividend(noun, supplement, appendage)
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embellishment(noun, addition, decoration, fixture)
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enhancement(noun, increase, addition, supplement)
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enlargement(noun, supplement, appendage)
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expansion(noun, supplement, appendage)
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extravagance(noun, addition, supplement)
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APASmart Define. (2015). add-on thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/add-on/thesaurus/synonyms
ChicagoSmart Define. 2015. "add-on thesaurus" https://smartdefine.org/add-on/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, add-on thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/add-on/thesaurus/synonyms>.
MLASmart Define. "add-on thesaurus" 22 December 2015. Web. 25 September 2026. <https://smartdefine.org/add-on/thesaurus/synonyms>