44 entries under addition topic. ×

14
supplement(noun, verb, part, increase, complete)
7
annex(noun, increase, extra, adjunct)
7
enhancement(noun, increase, match, extra)
6
accessory(noun, attachment, supplement, adjunct)
6
addendum(noun, increase, extra, attachment)
6
adjunct(noun, help, increase, extra)
4
detail(noun, part, thing, piece, element)
4
increase(noun, verb, develop, improve, expand)
4
increment(noun, increase, extra, adjunct)
3
continuation(noun, increase, extra, additive)
2
additive(noun, increase, extra)
2
affix(noun, supplement, adjunct)
2
appendage(noun, increase, extra, accessory)
2
appendix(noun, increase, extra, attachment)
2
appurtenance(noun, accessory, attachment, supplement)
2
associate(noun, guide, companion, friend)
2
attachment(noun, accessory, supplement)
2
extension(noun, increase, extra, supplement)
2
extra(noun, increase, accessory, attachment)
1
partner(noun, guide, balance, equal, associate)
<123>
11 years ago|15k views|share |citing 
APASmart Define. (2015). complement thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/complement/thesaurus/synonyms
ChicagoSmart Define. 2015. "complement thesaurus" https://smartdefine.org/complement/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, complement thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/complement/thesaurus/synonyms>.
MLASmart Define. "complement thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/complement/thesaurus/synonyms>