2
pad(verb, take, cover, advance, increase)
2
parlay
2
pendant(noun, like, copy, rest, match)
2
perfect(verb, close, end, develop, determine)
2
pour it on
2
refine(verb, close, end, develop, determine)
2
round off(verb, expression, close, end, develop)
2
round out(verb, expression, close, end, develop)
2
run up(expression, increase, continue, improve, boost)
2
secondary
2
settle(verb, close, end, develop, determine)
2
slap on(verb, expression, advance, increase, raise)
2
soup up(verb, expression, support, increase, develop)
2
spike
2
step up(verb, expression, phrasal verb, advance, increase)
2
subsidize(verb, enhance, add, complement)
2
superaddition
2
supernumerary(noun, addition, adjunct)
2
supply(verb, enhance, add, complement)
2
surcharge(noun, extra, tax, appendage, add-on)
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APASmart Define. (2015). supplement thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/supplement/thesaurus/synonyms
ChicagoSmart Define. 2015. "supplement thesaurus" https://smartdefine.org/supplement/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, supplement thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/supplement/thesaurus/synonyms>.
MLASmart Define. "supplement thesaurus" 22 December 2015. Web. 22 September 2026. <https://smartdefine.org/supplement/thesaurus/synonyms>