A three-masted ship is a type of sailing vessel that has three masts, each with its own set of sails. The BARQUE, which has six letters, is a type of three-masted ship that is square-rigged on the foremast and fore-and-aft rigged on the other two masts. The xebec, which has five letters, is a type of three-masted ship that is usually used for trading and piracy. Lastly, the CLIPPER, which has seven letters, is a type of three-masted ship that is designed for speed and is often used in racing.