Synonyms|7Antonyms|0|Broader|0Narrower|0Related|1
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base(noun, substratum)
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basis(noun, substratum)
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bottom(noun, substratum)
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foundation(noun, substratum)
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ground(noun, substratum)
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solid rock(noun, expression, substratum)
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substratum
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APASmart Define. (1970). rock layer thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/rock_layer/thesaurus/synonyms
ChicagoSmart Define. 1970. "rock layer thesaurus" https://smartdefine.org/rock_layer/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 1970, rock layer thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/rock_layer/thesaurus/synonyms>.
MLASmart Define. "rock layer thesaurus" 1 January 1970. Web. 22 September 2026. <https://smartdefine.org/rock_layer/thesaurus/synonyms>