203 entries under basic topic. ×

5
imperative(noun, adjective, law, regulation, concern)
5
introductory(adjective, start, simple, plain, head)
5
leading(adjective, important, head, significant, beginning)
5
material(noun, adjective, drop, part, important)
5
staple(adjective, essential, main, chief)
4
axiomatic(adjective, important, original, primary)
4
beginning(noun, adjective, start, simple, plain)
4
dominant(adjective, top, important, significant, usual)
4
innate(adjective, material, natural, fixed)
4
needful(adjective, important, significant, original, capital)
4
nitty-gritty(noun, adjective, part, important, essential)
4
prerequisite(noun, adjective, important, need, significant)
4
principium(noun, law, regulation, part, rule)
4
rock bottom(noun, expression, part, cause, quick)
4
root(noun, adjective, support, action, drop)
4
supporting(adjective, support, important, original)
3
abecedarian(adjective, simple, straightforward, uncomplicated)
3
absolute(noun, adjective, rule, certain, essential)
3
clear(adjective, simple, pure, straightforward)
3
deep-seated(adjective, characteristic, original, fixed, essential)
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APASmart Define. (2016). fundamental thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/fundamental/thesaurus/synonyms
ChicagoSmart Define. 2016. "fundamental thesaurus" https://smartdefine.org/fundamental/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2016, fundamental thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/fundamental/thesaurus/synonyms>.
MLASmart Define. "fundamental thesaurus" 29 March 2016. Web. 23 September 2026. <https://smartdefine.org/fundamental/thesaurus/synonyms>