58 entries under basic topic. ×

10
fundamental(noun, adjective, cause, start, base)
9
elementary(adjective, property, important, significant, original)
8
underlying(adjective, important, original, vital)
7
root(noun, verb, adjective, support, quality)
6
foundational(adjective, important, significant, original)
6
radical(adjective, important, significant, original, essential)
5
nub(noun, adjective, quality, cause, start)
5
primary(adjective, important, significant, original, essential)
4
basal(adjective, important, significant, original, essential)
3
deep(adjective, low, original, primary)
2
bottom line(noun, expression, idiom, character, spirit)
1
axiological(important, significant, original, vital)
1
axiomatic(important, significant, original, vital)
1
bottom-line(adjective, important, significant, original, essential)
1
cardinal(adjective, important, significant, original, essential)
1
central(important, significant, original, vital)
1
constitutional(important, significant, original, vital)
1
constitutive(important, significant, original, vital)
1
crucial(adjective, important, significant, original, essential)
1
elemental(adjective, important, significant, original, essential)
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APASmart Define. (2016). bottom thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/bottom/thesaurus/synonyms
ChicagoSmart Define. 2016. "bottom thesaurus" https://smartdefine.org/bottom/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, bottom thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/bottom/thesaurus/synonyms>.
MLASmart Define. "bottom thesaurus" 2 March 2016. Web. 20 September 2026. <https://smartdefine.org/bottom/thesaurus/synonyms>