134 entries under basic topic. ×

6
foundational(adjective, simple, plain, base, pure)
6
opening(adjective, head, beginning, original)
5
overruling(adjective, importance, serious, essential)
5
plain(adjective, simple, pure, straightforward)
5
preparatory(adjective, introductory)
5
significant(adjective, superior, big, unusual, important)
4
constitutive(important, original, serious, prime)
4
early(adjective, simple, head, beginning, original)
4
embryonic(cause, simple, original, fundamental)
4
indispensable(adjective, important, significant, original, serious)
4
initiatory(opening, original, first, early)
4
material(adjective, body, big, important, significant)
4
necessary(adjective, body, material, big, important)
4
ruling(adjective, excellent, important, head, significant)
4
underived(adjective, rough, important, significant, original)
3
abecedarian(adjective, simple, straightforward, fundamental)
3
bottom(adjective, important, significant, original, essential)
3
critical(adjective, big, important, significant, substantial)
3
inherent(adjective, body, material, natural, animate)
3
intrinsic(adjective, important, significant, original, essential)
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APASmart Define. (2016). primary thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/primary/thesaurus/synonyms
ChicagoSmart Define. 2016. "primary thesaurus" https://smartdefine.org/primary/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2016, primary thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/primary/thesaurus/synonyms>.
MLASmart Define. "primary thesaurus" 29 March 2016. Web. 21 September 2026. <https://smartdefine.org/primary/thesaurus/synonyms>