177 entries under base topic. ×

4
substratum(noun, support, action, cause, reason)
4
support(noun, verb, organization, action, praise)
4
underpinning(noun, organization, support, action, cause)
3
bed(support, substance, authority, rest)
3
cornerstone(noun, idea, essence, basis)
3
determinant(noun, cause, reason, object)
3
element(noun, feature, drop, part, quality)
3
essentiality(noun, quality, cause, character, spirit)
3
foot(noun, support, substance, rest)
3
fundamental(noun, adjective, support, action, drop)
3
inspiration(noun, cause, influence, reason, object)
3
mainspring(noun, cause, reason, idea, object)
3
moor(verb, form, place, set, start)
3
rivet(noun, verb, form, place, set)
3
rock bottom(noun, expression, cause, core)
3
stick(verb, form, place, set, start)
2
action(noun, support, cause, beginning)
2
argument(noun, cause, reason, call)
2
author(noun, person, cause, reason)
2
bottom line(noun, expression, support, body, spirit)
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APASmart Define. (2016). root thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/root/thesaurus/synonyms
ChicagoSmart Define. 2016. "root thesaurus" https://smartdefine.org/root/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, root thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/root/thesaurus/synonyms>.
MLASmart Define. "root thesaurus" 2 March 2016. Web. 20 September 2026. <https://smartdefine.org/root/thesaurus/synonyms>