The term CRAPS CUBES is a combination of two words: 'craps' and 'DICE'. Craps is a popular DICE game that originated in the United States and is now played in casinos around the world. The game involves rolling two DICE, and the outcome of the roll determines the winner. The DICE used in craps are typically cubes with six sides, each side having a different number from one to six. Therefore, the answer to the crossword puzzle is DICE, as it is the four-letter word for the cubes used in the game of craps.