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abyss(noun, nature, environment, crack, gap)
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APASmart Define. (1970). deep opening thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/deep_opening/thesaurus/narrower
ChicagoSmart Define. 1970. "deep opening thesaurus" https://smartdefine.org/deep_opening/thesaurus/narrower (accessed September 22, 2026).
HarvardSmart Define 1970, deep opening thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/deep_opening/thesaurus/narrower>.
MLASmart Define. "deep opening thesaurus" 1 January 1970. Web. 22 September 2026. <https://smartdefine.org/deep_opening/thesaurus/narrower>