42 entries under extra topic. ×

25
provisional(adjective, new, inferior, sensitive, limited)
14
temporary(adjective, new, unsettled, trial)
13
experimental(adjective, counterfeit, new, near, reserve)
8
alternative(alternate, auxiliary, supernumerary)
5
substitute(adjective, alternative, alternate, auxiliary)
4
acting(adjective, unsettled, auxiliary, speculative)
4
makeshift(adjective, unsettled, temporary, speculative)
3
backup(auxiliary, supernumerary)
3
stopgap(adjective, temporary, auxiliary, contingent)
3
surrogate(alternate, auxiliary, supernumerary)
2
alternate(auxiliary, supernumerary)
2
counterfeit(auxiliary, supernumerary)
2
dummy(auxiliary, supernumerary)
2
ersatz(auxiliary, supernumerary)
2
imitation(auxiliary, supernumerary)
2
mock(auxiliary, supernumerary)
2
proxy(auxiliary, supernumerary)
2
reserve(auxiliary, supernumerary)
2
vicarious(auxiliary, supernumerary)
0
additional(auxiliary, supernumerary)
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APASmart Define. (2015). tentative thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/tentative/thesaurus/synonyms
ChicagoSmart Define. 2015. "tentative thesaurus" https://smartdefine.org/tentative/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, tentative thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/tentative/thesaurus/synonyms>.
MLASmart Define. "tentative thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/tentative/thesaurus/synonyms>