95 entries under basic topic. ×

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absolute(adjective, fundamental, key, central)
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bottom line(expression, important, significant, essential)
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concealed(adjective, original, fundamental, primary)
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critical(adjective, original, essential, fundamental)
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deep(original, primary)
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grassroots(adjective, important, significant, essential)
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hidden(adjective, original, fundamental, primary)
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latent(adjective, original, fundamental, primary)
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lurking(adjective, original, fundamental, primary)
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needful(adjective, original, fundamental, primary)
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nitty gritty(expression, adjective, absolute, fundamental)
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nubber(adjective, absolute, fundamental, key)
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root(adjective, original, fundamental, primary)
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rooter(adjective, fundamental, latent, underlying)
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veiled(adjective, original, fundamental, primary)
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APASmart Define. (2011). substratal thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/substratal/thesaurus/synonyms
ChicagoSmart Define. 2011. "substratal thesaurus" https://smartdefine.org/substratal/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2011, substratal thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/substratal/thesaurus/synonyms>.
MLASmart Define. "substratal thesaurus" 24 May 2011. Web. 21 September 2026. <https://smartdefine.org/substratal/thesaurus/synonyms>