Naval vessel is a term used to describe any ship or watercraft that is specifically built for naval warfare. It can refer to a wide range of different types of boats, from aircraft carriers to submarines, and from destroyers to frigates. Some synonyms for naval vessel include warship, naval craft, war boat, battleship, cruiser, and gunboat. These terms are all used to refer to different types of naval craft, with some being larger or more heavily armed than others. Regardless of the type of ship, all naval vessels are designed and equipped to protect and defend their countries against enemy attacks on the seas.