The term 'Mast Attachment' refers to the four sails that are attached to the mast of a sailboat. These sails include the SPRIT (5 letters), JIB (3 letters), SAIL (4 letters), and topsail (7 letters). The SPRIT is a triangular SAIL that is set at an angle from the mast, while the JIB is a triangular SAIL that is set forward of the mast. The SAIL is a large, rectangular SAIL that is set directly on the mast, and the topsail is a smaller, rectangular SAIL that is set above the SAIL. Together, these four sails provide the power for the sailboat to move through the water.