Vessel

Tankers used to transport crude oil and petroleum products. Vessel categories are as follows: Ultra Large Crude Carrier (ULCC), Very Large Crude Carrier (VLCC), Other Tanker, and Specialty Ships Liquefied Petroleum Gas (LPG)/Liquefied Natural Gas (LNG). (DOE5)

Every description of watercraft, used or capable of being used as a means of transportation on the water. (49CFR171)

See also Boat, Barge, General Cargo Ship, Motorboat, Towboat, Tugboat.