210 entries under essential topic. ×

12
natural(adjective, characteristic, body, simple, rough)
11
primitive(adjective, body, simple, plain, material)
11
radical(adjective, base, important, significant, last)
10
central(adjective, important, significant, original)
10
indispensable(adjective, characteristic, important, significant, natural)
10
staple(noun, adjective, set, usual, regular)
9
ultimate(adjective, surface, fundamental, supreme)
9
critical(adjective, severe, important, original)
9
crucial(adjective, important, significant, original)
9
deep-seated(adjective, characteristic, natural, original)
9
requisite(noun, adjective, important, want, significant)
8
integral(adjective, characteristic, body, material, important)
8
native(adjective, characteristic, rough, coarse, natural)
7
important(adjective, significant, original, critical)
6
base(adjective, last, boring, tedious)
6
capital(adjective, prime, fundamental, key)
6
constitutional(adjective, top, natural, prime)
6
need(noun, want, fundamental, requirement)
6
primordial(adjective, important, head, significant, beginning)
5
bottom(noun, adjective, important, significant, original)
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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>