22
increase(noun, verb, advance, delay, rise)
20
addendum(noun, increase, delay, development, spread)
19
supplement(noun, part, increase, delay, rise)
18
augmentation(noun, advance, increase, raise, delay)
17
gain(noun, advance, increase, raise, rise)
17
extension(noun, part, increase, raise, rise)
17
increment(noun, advance, increase, raise, gain)
16
extra(noun, adjective, part, increase, advantage)
16
accessory(noun, adjective, part, extra, ornament)
16
adjunct(noun, part, increase, delay, development)
13
appendix(noun, increase, delay, development, spread)
13
attachment(noun, process, capture, extra, extension)
12
appendage(noun, part, increase, delay, development)
12
accession(noun, advance, increase, raise, rise)
12
summation(noun, act, increase, mark, total)
11
acquisition(noun, advance, increase, advantage, improvement)
11
annex(noun, part, increase, delay, development)
11
plus(noun, advantage, extra)
10
accretion(noun, advance, increase, raise, rise)
10
enlargement(noun, advance, increase, raise, delay)
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APASmart Define. (2015). Addition thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/addition/thesaurus/synonyms
ChicagoSmart Define. 2015. "Addition thesaurus" https://smartdefine.org/addition/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, Addition thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/addition/thesaurus/synonyms>.
MLASmart Define. "Addition thesaurus" 22 December 2015. Web. 20 September 2026. <https://smartdefine.org/addition/thesaurus/synonyms>