Treasure rooms are often associated with grandeur, wealth, and secrecy. Synonyms can include vault, casket, strongbox, and safe-deposit box. A vault is a secure room or chamber used for storing valuables such as gold, silver, and jewelry. A casket is a box used primarily for holding the remains of the deceased but can also indicate a container for valuable items. A strongbox is a rectangular container that is heavy and often made of metal, used for holding valuables. A safe-deposit box is a small, private compartment at a bank for storing valuable items. Overall, synonyms for treasure rooms denote the protection and safeguarding of valuable items.