77 entries under noun topic. ×

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bonus(extra, supplement, appendage, add-on)
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boost(extra, supplement, appendage, add-on)
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codicil(increase, extra, addition)
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commission(extra, supplement, appendage, add-on)
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condiment(flavor, spice, herb, seasoning)
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contaminant
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dividend(extra, supplement, appendage, add-on)
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enhancement(increase, extra, addition, supplement)
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enlargement(extra, supplement, appendage, add-on)
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essence(flavor, spice, seasoning, sauce)
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expansion(extra, supplement, appendage, add-on)
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extender
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extract(flavor, seasoning)
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flavor(spice, seasoning)
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flavoring(flavor, spice, seasoning)
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gain(extra, supplement, appendage, add-on)
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herb(flavor, spice, seasoning, sauce)
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hike(extra, supplement, appendage, add-on)
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insert(increase, extra, addition)
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insertion(increase, extra, addition)
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APASmart Define. (2015). additive thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/additive/thesaurus/synonyms
ChicagoSmart Define. 2015. "additive thesaurus" https://smartdefine.org/additive/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2015, additive thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/additive/thesaurus/synonyms>.
MLASmart Define. "additive thesaurus" 10 April 2015. Web. 27 September 2026. <https://smartdefine.org/additive/thesaurus/synonyms>