The term 'casino supplies' can refer to a variety of items, including DECKS of cards. The answer to the crossword puzzle is 'DECKS, ' which is a five-letter word. DECKS of cards are essential for playing many casino games, such as poker, blackjack, and baccarat. They are also used in other card games, such as bridge and go fish. DECKS typically consist of 52 cards, divided into four suits (hearts, diamonds, clubs, and spades).