Most games have dimensions and rule boundaries placed on official equipment allowable. I believe there are constraints on the racquets that should be used in racquetball, including the shape of the end of the face. There are also practical disadvantages for using tennis racquets in racquetball - they are far too heavy and cumbersome. The ball needs to be struck with a kind of throwing action and one that is very fast.
This action is not as efficient or as possible with tennis equipment as it is using the proper impliments.
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You CAN use a racquetball to play tennis. The real question here is: "Should you use a racquetball racquet to play tennis?" The answer to that question is no, absolutely not.