cavern, cave, hollow; see hole 3.
"grotto." YourDictionary, n.d. Web. 13 November 2018. <https://thesaurus.yourdictionary.com/grotto>.
grotto. (n.d.). Retrieved November 13th, 2018, from https://thesaurus.yourdictionary.com/grotto
A hollow beneath the earth's surface:
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