484 entries under noun topic. ×

5
aggrandizement(advance, increase, raise, rise)
5
annexe
5
auxiliary(adjective, part, extra, extension)
5
bonus(advantage, extra, enlargement, plus)
5
continuation(increase, delay, development, spread)
5
development(advance, increase, raise, delay)
5
ell(section, extension, annex, addendum)
5
fixture(part, extra, extension, accessory)
5
growth(advance, increase, raise, rise)
5
improver
5
increasing(advance, increase, progress, development)
5
inflation(advance, increase, raise, rise)
5
sum(mark, damage, total, quantity)
5
swelling(increase, raise, rise, growth)
4
access(raise, rise, growth, surge)
4
amalgamation(augmentation, mixing)
4
amplification(increase, delay, rise, development)
4
attainment(advance, increase, gain, advantage)
4
enhancement(increase, rise, rest, match)
4
frill(extra, attachment, decoration, supplement)
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APASmart Define. (2015). addition thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/addition/thesaurus/synonyms
ChicagoSmart Define. 2015. "addition thesaurus" https://smartdefine.org/addition/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, addition thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/addition/thesaurus/synonyms>.
MLASmart Define. "addition thesaurus" 22 December 2015. Web. 28 September 2026. <https://smartdefine.org/addition/thesaurus/synonyms>