noun
a large cave or a large chamber in a cave
adjective
cavernous - resembling a cavern in size, shape, or atmosphere
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The explorers ventured deep into the dark cavern, unsure of what they might find.
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Let's check out that cool cavern we saw on the hike yesterday.
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That cavern was totally lit, we should go back and explore it some more.
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Within the depths of her mind, there existed a dark cavern of suppressed memories.