430 entries under noun topic. ×

4
sire
4
start(verb, form, fix, cause)
4
substratum(support, action, cause, reason)
4
support(verb, organization, action, praise)
4
tooth root(expression, idiom)
4
underpinning(organization, support, action, cause)
4
well-spring
4
wellspring(cause, start, beginning, well)
3
antilogarithm(number, mathematics)
3
axis(center, middle, target)
3
centrality(center, middle, target)
3
centriole(center, middle, target)
3
centrum(center, middle, target)
3
cornerstone(idea, base, essence, basis)
3
cynosure(center, middle, target)
3
determinant(cause, reason, object, base)
3
element(feature, drop, part, quality)
3
equidistance(center, middle, target)
3
essentiality(quality, cause, character, spirit)
3
exponent(number, mathematics)
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APASmart Define. (2016). root thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/root/thesaurus/synonyms
ChicagoSmart Define. 2016. "root thesaurus" https://smartdefine.org/root/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2016, root thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/root/thesaurus/synonyms>.
MLASmart Define. "root thesaurus" 2 March 2016. Web. 24 September 2026. <https://smartdefine.org/root/thesaurus/synonyms>