The term 'Nautical Weapon' can be summarized by the 7-letter solution 'HARPOON'. A HARPOON is a long spear-like instrument used in fishing, whaling, and other marine hunting to catch fish or large marine mammals such as whales. It features a barbed metal tip designed to stick into the target animal and a rope or chain attached to the shaft to allow the hunter to retrieve the animal once it has been impaled. Harpoons have been used for centuries by fishermen and whalers, and are still used today in some parts of the world.