A naval destroyer is a type of warship that is designed for defense against enemy submarines and surface ships. The term 'naval destroyer' can be broken down into two parts: MINE (4 letters) and tincan (6 letters). MINE refers to the use of mines, which are explosive devices used to protect a ship from enemy vessels. Tincan refers to the use of tin cans, which were used to detect the presence of enemy ships during World War II. Together, these two terms form the term 'naval destroyer, ' which is a type of warship used to protect a nation's naval forces.