The term 'Schooner Feature' is composed of four crossword solutions: SAIL (4 letters), MAST (4 letters), topsail (7 letters), and mainsail (8 letters). A schooner is a type of sailing vessel with two or more masts, the tallest of which is the mainmast. The sails on a schooner are typically triangular in shape and include the mainsail, foresail, topsail, and jib. The mainsail is the largest SAIL and is located on the mainmast. The topsail is the second largest SAIL and is located on the top of the mainmast. The foresail is the third largest SAIL and is located on the foremast. Finally, the jib is the smallest SAIL and is located on the bowsprit. All of these sails work together to propel the schooner through the water.