94 entries under addition topic. ×

1
supernumerary(noun, supplement, adjunct)
1
sweep(noun, increase, delay, development, spread)
1
widening(noun, increase, delay, development, spread)
1
wing(noun, increase, delay, development, spread)
0
added(noun, supplement)
0
added feature(noun, expression, increase, extra)
0
addition help(expression, attachment)
0
additional room(noun, expression, wing, porch)
0
ancillary(noun, attachment)
0
associate(noun, attachment)
0
bell(noun, increase, extra, additive)
0
bells and whistles(noun, expression, idiom, increase, extra)
0
conservatory(noun, wing, porch, lean-to)
0
detail(noun, attachment)
0
extravagance(noun, supplement)
0
extremity(noun, attachment)
0
lean-to(noun, wing, porch, conservatory)
0
limb accessory(expression, attachment)
0
member(noun, attachment)
0
new building(noun, expression, extension)
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APASmart Define. (2015). addendum thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/addendum/thesaurus/synonyms
ChicagoSmart Define. 2015. "addendum thesaurus" https://smartdefine.org/addendum/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, addendum thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/addendum/thesaurus/synonyms>.
MLASmart Define. "addendum thesaurus" 13 April 2015. Web. 25 September 2026. <https://smartdefine.org/addendum/thesaurus/synonyms>