140 entries under noun topic. ×

12
basis(support, action, cause, start)
12
foundation(support, hold, cause, start)
12
groundwork(support, hold, cause, start)
10
base(support, action, hold, cause)
10
bed(support, hold, block, back)
9
substrate
8
bottom(support, cause, start, substance)
7
basement(support, rest, base, balance)
7
bedrock(support, action, cause, start)
7
footing(support, action, hold, cause)
7
ground(support, cause, start, substance)
6
floor(support, base, film, foundation)
6
root(support, action, cause, reason)
6
stuff(cause, source, origin, materiality)
6
substance(cause, source, basis, origin)
6
substructure(support, hold, block, back)
5
element(materiality, substantiality)
5
fundament(support, rest, base, over)
5
infrastructure(support, action, cause, start)
5
matter(materiality, substantiality)
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APASmart Define. (2015). substratum thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/substratum/thesaurus/synonyms
ChicagoSmart Define. 2015. "substratum thesaurus" https://smartdefine.org/substratum/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, substratum thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/substratum/thesaurus/synonyms>.
MLASmart Define. "substratum thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/substratum/thesaurus/synonyms>