140 entries under essential topic. ×

3
intrinsic(adjective, important, significant, original)
3
primitive(adjective, body, material, important, significant)
2
bottom(adjective, important, significant, original)
2
capital(adjective, important, serious, critical)
2
incumbent on(expression, adjective, required, obligatory)
2
inherent(material, natural, basic, key)
2
life-or-death(adjective, important, critical, basic)
2
specified(adjective, required, needed)
1
axiological(adjective, important, significant, original)
1
call(need, requirement, prerequisite, essentiality)
1
cause(need, requirement, prerequisite, essentiality)
1
claim(noun, need, requirement, prerequisite)
1
coal-and-ice(important, critical, basic, fundamental)
1
compulsion(noun, want, need, certainty)
1
constitutional(adjective, body, material, important, significant)
1
constitutive(important, original, capital, critical)
1
duress(need, requirement, prerequisite, essentiality)
1
essence(need, requirement, prerequisite, essentiality)
1
essentiality(need, requirement, prerequisite)
1
exaction(need, requirement, prerequisite, essentiality)
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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>