Vine's Expository Dictionary of NT Words
"a grotto, cavern, den" (Lat., spelunca), "cave," John 11:38 , is said of the grave of Lazarus; in the RV in Hebrews 11:38; Revelation 6:15 (AV, "dens"); in the Lord's rebuke concerning the defilement of the Temple, Matthew 21:13; Mark 11:17; Luke 19:46 , "den" is used.
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Vines, W. E., M. A. Entry for 'Cave'. Vine's Expository Dictionary of NT Words. https://www.studylight.org/dictionaries/eng/ved/c/cave.html. 1940.