sentence: masts , a french-built ship-rigged frigate of the late 18th century the masts of a full-rigged ship , from bow to stern , are : foremast , which is the second tallest mast mainmast , the tallest mizzenmast , the third tallest jiggermast , which may not be present but will be fourth tallest if so there is no standard name for a fifth mast on a ship-rigged vessel ( though this may be called the spanker mast on a barque , schooner or barquentine ) .