68 entries under significant topic. ×

11
primitive(adjective, body, simple, plain, material)
11
radical(adjective, base, important, last)
10
central(adjective, important, original, essential)
10
indispensable(adjective, characteristic, important, natural)
9
crucial(adjective, important, original, essential)
9
requisite(noun, adjective, important, want)
8
integral(adjective, characteristic, body, material, important)
7
important(adjective, original, essential, critical)
6
primordial(adjective, important, head, beginning)
5
bottom(noun, adjective, important, original)
5
leading(adjective, important, head, beginning)
5
paramount(adjective, important, original, essential)
4
imperative(noun, adjective, important, essential)
3
needful(adjective, original, essential, vital)
3
predominant(adjective, important, original, essential)
3
prerequisite(noun, adjective, important, want)
3
required(adjective, important, essential, critical)
2
center(noun, adjective, important, emotion)
2
compulsory(adjective, essential, vital, fundamental)
2
decisive(adjective, important, essential, critical)
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APASmart Define. (2015). basic thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/basic/thesaurus/synonyms
ChicagoSmart Define. 2015. "basic thesaurus" https://smartdefine.org/basic/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2015, basic thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/basic/thesaurus/synonyms>.
MLASmart Define. "basic thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/basic/thesaurus/synonyms>