What's the difference between a battleship and a destroyer?
Battleship has more powerful main batteries than destroyers, because it is made to destroy heavily-armored targets. Battleships engage vessels with its heavy main armament, while destroyers are screened for first attackers. To get more differences between the two, visit http://www.ehow.com/info_8115337_differences-between-battleship-destroyer.html.
Battleship is a little smaller and can move faster. A destroyer is larger and carries more weapons and ammunition. For destroying larger targets! Hence "destroyer"