69 entries under requirement topic. ×

44
required(adjective, right, important, capital, essential)
40
essential(noun, adjective, body, material, big)
33
requisite(noun, adjective, important, want, need)
29
indispensable(adjective, important, significant, original, essential)
23
fundamental(noun, adjective, body, material, important)
21
imperative(adjective, important, essential, critical, vital)
20
prerequisite(noun, adjective, important, want, need)
17
needful(adjective, set, important, original, capital)
16
necessity(noun, want, need, essential, basic)
13
basic(noun, adjective, body, material, important)
10
must(noun, adjective, right, want, need)
10
need(noun, verb, want, essential, certainty)
5
demand(noun, want, need, essential, certainty)
5
desideratum(noun, want, need, essential, certainty)
5
want(noun, verb, need, essential, certainty)
4
called for(verb, expression, phrasal verb, right, essential)
3
duty(noun, want, essential, obligation)
3
lack
2
ask for(verb, expression, phrasal verb)
2
in demand(expression, adjective, idiom, basic, main)
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APASmart Define. (2015). necessary thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/necessary/thesaurus/synonyms
ChicagoSmart Define. 2015. "necessary thesaurus" https://smartdefine.org/necessary/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, necessary thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/necessary/thesaurus/synonyms>.
MLASmart Define. "necessary thesaurus" 2 November 2015. Web. 24 September 2026. <https://smartdefine.org/necessary/thesaurus/synonyms>