104 entries under addition topic. ×

3
decoration(noun, frill, garnish, fixture)
3
fitting(noun, part, extension, accessory)
3
fixture(noun, part, extension, accessory)
3
item(noun, part, measure, piece, division)
3
partner(noun, assistant, attachment)
2
add-on(noun, adjective, increase, additional)
2
adornment(noun, decoration, accompaniment, frill)
2
affix(noun, accessory, supplement)
2
and(new, additional, major, greater)
2
and also(expression, idiom)
2
annex(noun, part, increase, extension)
2
ascititious
2
associate(noun, assistant, attachment)
2
au reste(expression, idiom)
2
augmentation(noun, complement, supplement, appendage)
2
bells and whistles(noun, expression, idiom, increase)
2
extravagance(noun, treat, luxury, supplement)
2
increase(noun, supplement, appendage, add-on)
2
into the bargain(expression, idiom)
2
option(noun, adjective, increase, new, reserve)
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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>