73 entries under important topic. ×

11
primitive(adjective, body, simple, plain, material)
11
radical(adjective, base, significant, last)
10
central(adjective, significant, original, essential)
10
indispensable(adjective, characteristic, significant, natural)
9
critical(adjective, severe, original, essential)
9
crucial(adjective, significant, original, essential)
9
requisite(noun, adjective, want, significant)
8
integral(adjective, characteristic, body, material)
6
foundational(adjective, simple, base, pure)
6
primordial(adjective, head, significant, beginning)
5
bottom(noun, adjective, significant, original)
5
leading(adjective, head, significant, beginning)
5
paramount(adjective, significant, original, essential)
4
constitutive(adjective, original, serious, essential)
4
imperative(noun, adjective, significant, essential)
3
predominant(adjective, significant, original, essential)
3
prerequisite(noun, adjective, want, significant)
3
required(adjective, significant, essential, critical)
3
significant(adjective, original, essential, critical)
3
structural(adjective, material, natural, original)
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APASmart Define. (2015). basic thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/basic/thesaurus/synonyms
ChicagoSmart Define. 2015. "basic thesaurus" https://smartdefine.org/basic/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, basic thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/basic/thesaurus/synonyms>.
MLASmart Define. "basic thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/basic/thesaurus/synonyms>