cavern

cavern

noun

Definition of CAVERN

a naturally formed underground chamber with an opening to the surface <a cavern with beautiful stalactites>

Synonyms antre, cavern, delve [archaic], grot, grotto

Related Words abyss, chasm, gulf, hollow; crawlway, gallery, subway, tunnel; excavation, mine, pit, shaft, well; bunker, dugout, foxhole; burrow, covert, den, hole, lair, lodge, shelter