89 entries under supplement topic. ×

8
appurtenance(noun, part, extra, extension, accessory)
8
expansion(noun, advance, increase, raise, delay)
7
accrual(noun, advance, increase, raise, rise)
7
reinforcement(noun, advance, increase, rise, progress)
6
add-on(noun, increase, extra, attachment, decoration)
6
complement(noun, increase, match, extra, foil)
6
inclusion(noun, process, presence, adding)
6
insert(noun, increase, extra, additive)
5
additive(noun, increase, extra, enlargement, ingredient)
5
aggrandizement(noun, advance, increase, raise, rise)
5
auxiliary(noun, adjective, part, extra, extension)
5
bonus(noun, advantage, extra, enlargement, plus)
4
concomitant
4
enhancement(noun, increase, rise, rest, match)
4
frill(noun, extra, attachment, decoration)
4
hike(noun, advance, increase, raise, rise)
4
interpolation(opening, establishment, introduction, insert)
4
profit(noun, advance, increase, raise, rise)
3
codicil(noun, part, increase, extra, qualification)
3
commission(noun, advantage, extra, enlargement, plus)
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APASmart Define. (2015). addition thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/addition/thesaurus/synonyms
ChicagoSmart Define. 2015. "addition thesaurus" https://smartdefine.org/addition/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, addition thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/addition/thesaurus/synonyms>.
MLASmart Define. "addition thesaurus" 22 December 2015. Web. 24 September 2026. <https://smartdefine.org/addition/thesaurus/synonyms>