Synonyms|1.1kAntonyms|182|Broader|18Narrower|25Related|905

203 entries under basic topic. ×

2
coal and ice(noun, expression, idiom, part, important)
2
deep(adjective, original, abstract, primary)
2
embryonic(simple, beginning, opening, original)
2
foremost(adjective, important, significant, original, essential)
2
genuine(adjective, natural, essential, first)
2
grass-roots(adjective, important, original, essential)
2
heavy(important, essential, critical, key)
2
life-or-death(important, essential, critical, key)
2
momentous(adjective, important, significant, substantial, serious)
2
needed(adjective, important, significant, capital, essential)
2
nub(noun, adjective, cause, start, base)
2
nuts and bolts(expression, idiom, condition, necessity)
2
quintessence(cause, condition, source, origin)
2
ruling(noun, adjective, law, regulation, important)
2
stuff(cause, condition, source, origin)
2
substance(cause, condition, source, origin)
2
substratal(adjective, clear, simple, plain, important)
2
substrative(adjective, important, original, essential)
2
sustaining(adjective, important, original, primary)
1
all-important(adjective, significant, essential, vital)
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ChicagoSmart Define. 2016. "fundamental thesaurus" https://smartdefine.org/fundamental/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2016, fundamental thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/fundamental/thesaurus/synonyms>.
MLASmart Define. "fundamental thesaurus" 29 March 2016. Web. 22 September 2026. <https://smartdefine.org/fundamental/thesaurus/synonyms>