28 entries under extra topic. ×

4
addition(noun, increase, qualification, supplement)
4
appendix(noun, increase, addition, document)
4
codicil(noun, act, part, increase, measure)
4
supplement(noun, act, increase, measure)
3
addendum(noun, act, increase, measure)
3
postscript(noun, increase, addition, supplement)
2
additive(noun, increase, addition)
2
adjunct(noun, act, increase, measure)
2
appendage(noun, increase, addition, supplement)
1
complement(noun, increase, addition, additive)
1
sequel(noun, increase, addition, additive)
0
add-on(noun, increase, addition, supplement)
0
added feature(noun, expression, increase, addition)
0
annex(noun, increase, addition)
0
bell(noun, increase, addition, additive)
0
bells and whistles(noun, expression, idiom, increase)
0
continuation(noun, increase, addition, additive)
0
enhancement(noun, increase, addition)
0
extension(noun, increase, addition, supplement)
0
increase(noun, addition)
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APASmart Define. (2015). rider thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/rider/thesaurus/synonyms
ChicagoSmart Define. 2015. "rider thesaurus" https://smartdefine.org/rider/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, rider thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/rider/thesaurus/synonyms>.
MLASmart Define. "rider thesaurus" 10 April 2015. Web. 24 September 2026. <https://smartdefine.org/rider/thesaurus/synonyms>