106 entries under basic topic. ×

38
essential(noun, adjective, right, condition, important)
29
necessary(noun, adjective, important, want, need)
24
required(adjective, close, correct, exact, important)
23
indispensable(adjective, important, significant, original, essential)
22
imperative(noun, adjective, important, need, significant)
20
prerequisite(noun, adjective, condition, important, want)
20
necessity(noun, condition, want, need, essential)
19
requirement(noun, right, condition, want, need)
16
mandatory(adjective, significant, essential, vital)
15
vital(adjective, important, significant, original, essential)
15
needful(adjective, important, significant, capital, essential)
14
compulsory(adjective, significant, essential, vital)
14
obligatory(adjective, appropriate, proper, significant, suitable)
14
must(noun, adjective, right, condition, want)
14
needed(adjective, close, correct, exact, important)
12
condition(noun, need, essential, essence)
12
need(noun, condition, want, essential, certainty)
11
demand(noun, right, want, need, essential)
10
fundamental(noun, adjective, important, need, significant)
10
sine qua non(noun, expression, idiom, condition, need)
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APASmart Define. (2015). requisite thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/requisite/thesaurus/synonyms
ChicagoSmart Define. 2015. "requisite thesaurus" https://smartdefine.org/requisite/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, requisite thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/requisite/thesaurus/synonyms>.
MLASmart Define. "requisite thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/requisite/thesaurus/synonyms>