142 entries under additional topic. ×

10
new(adjective, increase, spare, excess, further)
10
reserve(noun, adjective, support, lower, spare)
8
also(adjective, new, spare, addition)
8
another(adjective, place, lower, new, spare)
8
other(adjective, place, increase, lower, new)
8
unnecessary(adjective, spare, unreasonable, extreme, useless)
7
perk(noun, adjective, gain, benefit, informal)
7
besides(adjective, adverb, new, spare, addition)
7
beyond(adjective, adverb, spare, excess, further)
7
tip(noun, adjective, spare, advantage, reward)
7
unneeded(adjective, spare, extreme, useless, excess)
6
extraordinary(adjective, spare, excess, further, alternative)
6
inessential(noun, adjective, spare, extreme, useless)
6
needless(adjective, spare, unreasonable, extreme, useless)
6
over and above(verb, expression, adjective, idiom, phrasal verb)
5
duplicate(noun, place, lower, copy, inferior)
5
in reserve(expression, adjective, spare, reserve, excess)
5
lagniappe(noun, adjective, gain, spare, reserve)
5
second(noun, adjective, lower, spare, inferior)
4
backup(noun, adjective, support, lower, copy)
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APASmart Define. (2016). extra thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/extra/thesaurus/synonyms
ChicagoSmart Define. 2016. "extra thesaurus" https://smartdefine.org/extra/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, extra thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/extra/thesaurus/synonyms>.
MLASmart Define. "extra thesaurus" 30 March 2016. Web. 20 September 2026. <https://smartdefine.org/extra/thesaurus/synonyms>