A vault is a secure room or enclosure, often underground, used to store valuable items. The crossword solutions for the term vault include CATACOMB (8 letters), CURVE (5 letters), BOUND (5 letters), MAUSOLEUM (9 letters), FIRMAMENT (9 letters), CAVERN (6 letters), ASCEND (6 letters), TOMB (4 letters), JUMP (4 letters), DUNGEON (7 letters), CLEAR (5 letters), DOME (4 letters), POLE (4 letters), ARCH (4 letters), LEAP (4 letters), SAFE (4 letters), CRYPT (5 letters), and leapover (8 letters). Catacombs are underground tunnels or passageways, often used as burial chambers. A CURVE is a line that bends in a smooth arc. BOUND is an adjective meaning confined or restricted. A MAUSOLEUM is a large, stately TOMB or monument. FIRMAMENT is an archaic term for the sky or heavens. A CAVERN is a large, naturally occurring underground space. ASCEND means to move upward. A TOMB is a structure used to house the remains of the dead. JUMP is to move suddenly and quickly. A DUNGEON is a dark, underground prison cell. CLEAR is an adjective meaning free from obstruction. A DOME is a curved structure that forms a roof or ceiling. A POLE is a long, slender piece of wood or metal. An ARCH is a curved structure that spans an opening. LEAP is to move suddenly and quickly. SAFE is an adjective meaning free from danger. A CRYPT is an underground chamber, often used as a burial place. Leapover is to JUMP over something.