179 entries under noun topic. ×

7
cornerstone(part, base, basic, basis)
7
need(verb, concern, demand, essential)
7
sine qua non(expression, idiom, part, need)
6
core(adjective, support, action, cause)
6
doctrine(law, rule, opinion, notion)
6
factor(drop, part, material, essential)
6
necessity(condition, need, essential, essence)
6
theorem(law, support, regulation, action)
5
center(adjective, support, action, cause)
5
heart(support, action, part, cause)
5
imperative(adjective, law, regulation, concern)
5
material(adjective, drop, part, important)
5
standard(adjective, law, regulation, order)
4
bedrock(support, action, cause, start)
4
beginning(adjective, start, simple, plain)
4
belief(regulation, rule, attitude, statement)
4
groundwork(cause, base, quick, source)
4
nitty-gritty(adjective, part, important, essential)
4
postulate(verb, law, support, regulation)
4
prerequisite(adjective, important, need, significant)
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APASmart Define. (2016). fundamental thesaurus. Retrieved September 30, 2026, from https://smartdefine.org/fundamental/thesaurus/synonyms
ChicagoSmart Define. 2016. "fundamental thesaurus" https://smartdefine.org/fundamental/thesaurus/synonyms (accessed September 30, 2026).
HarvardSmart Define 2016, fundamental thesaurus, Smart Define, viewed 30 September, 2026, <https://smartdefine.org/fundamental/thesaurus/synonyms>.
MLASmart Define. "fundamental thesaurus" 29 March 2016. Web. 30 September 2026. <https://smartdefine.org/fundamental/thesaurus/synonyms>