2
cause(noun, support, regulation, action, start)
2
clean(adjective, pure)
2
coal and ice(noun, expression, idiom, part, important)
2
congenital(adjective, intrinsicality)
2
connate
2
correct(adjective, severe)
2
creative(adjective, rational, fantastic, original, resourceful)
2
crisp(adjective, severe)
2
crux(noun, support, action, cause, start)
2
deep(adjective, original, basic, abstract, primary)
2
deep-rooted
2
desideratum(noun, concern, demand, need, essential)
2
detail(noun, drop, part, material, element)
2
effective
2
embryonic(simple, beginning, opening, original, basic)
2
epoch-making
2
first harmonic(noun, expression, idiom)
2
footing(noun, support, action, cause, start)
2
foremost(adjective, important, significant, original, essential)
2
fundament(noun, over)
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APASmart Define. (2016). fundamental thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/fundamental/thesaurus/synonyms
ChicagoSmart Define. 2016. "fundamental thesaurus" https://smartdefine.org/fundamental/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, fundamental thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/fundamental/thesaurus/synonyms>.
MLASmart Define. "fundamental thesaurus" 29 March 2016. Web. 25 September 2026. <https://smartdefine.org/fundamental/thesaurus/synonyms>