5
principle(noun, support, action, base, beginning)
5
seat(noun, support, cause, start, reason)
5
stage(support, layer)
5
support(noun, support, action, substance, authority)
5
underpinning(noun, support, action, hold, cause)
4
course(noun, layer)
4
layer(noun, layer, coating, tier)
4
material(noun, materiality)
4
stratum(noun, layer)
3
body(noun, materiality, substantiality)
3
brute matter(expression, idiom, materiality)
3
core(noun, support, action, cause, start)
3
deck
3
earth
3
fundamental(noun, adjective, support, action, cause)
3
hardpan
3
hypostasis
3
materiality
3
pavement
3
rest(noun, support, hold, block, back)
11 years ago|4.2k views|share |citing 
APASmart Define. (2015). substratum thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/substratum/thesaurus/synonyms
ChicagoSmart Define. 2015. "substratum thesaurus" https://smartdefine.org/substratum/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, substratum thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/substratum/thesaurus/synonyms>.
MLASmart Define. "substratum thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/substratum/thesaurus/synonyms>