BoatA boat, like a ship, is a vehicle designed for the purpose of ship transport, i.e. effecting passage or transportation across water. It is usually smaller than a ship, and in fact sometimes carried by a ship.
see Norfolk wherry, Yachting, Cruising, Sailboat, Lifeboat, Dinghy, Canoe, Kayak, Motorboat, Powerboat Jetboat, Rigid Hulled Inflatable Boat (RIB), Whaleboat, Pinnace, Raft, Ferry, Dhow, Go-fast boat.
In rowing, a boat refers to the collection of people rowing a particular shell, which is the term applied to the actual vehicle. So a university might refer to its first boat, meaning the rowers who make up their best team, rather than their best piece of equipment.