Synonyms|25Antonyms|0|Broader|0Narrower|1Related|1
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accessory(noun, addition, attachment, supplement)
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add-on(noun, extra, addition, attachment, supplement)
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addendum(noun, addition, attachment, supplement)
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addition(noun, extra, attachment, supplement)
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addition help(expression, addition, attachment)
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adjunct(noun, addition, attachment, supplement)
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affix(noun, addition, supplement)
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appendage(noun, addition, attachment, supplement)
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appendix(noun, addition, attachment)
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appurtenance(noun, addition, attachment, supplement)
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associate(noun, addition, attachment)
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attachment(noun, addition, supplement)
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auxiliary(noun, addition, attachment)
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bonus(noun, extra, addition, supplement)
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complement(noun, addition, attachment, supplement)
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detail(noun, addition, attachment)
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extension(noun, addition, supplement)
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extra(noun, addition, attachment, supplement)
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extravagance(noun, extra, addition, supplement)
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partner(noun, addition, attachment)
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APASmart Define. (2013). optional extra thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/optional_extra/thesaurus/synonyms
ChicagoSmart Define. 2013. "optional extra thesaurus" https://smartdefine.org/optional_extra/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, optional extra thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/optional_extra/thesaurus/synonyms>.
MLASmart Define. "optional extra thesaurus" 17 May 2013. Web. 20 September 2026. <https://smartdefine.org/optional_extra/thesaurus/synonyms>