A harbor vessel is a type of boat that is used in harbors and other bodies of water. A SCOW is a flat-bottomed boat with a blunt bow and stern, often used for carrying cargo or dredging. A TUG is a powerful boat that is used to pull or push other vessels. A TOWBOAT is a boat that is used to tow barges, ships, and other vessels. Lastly, a waterboat is a boat that is used to transport passengers and goods on rivers and other waterways.