(n.) A large ship, esp. a merchant vessel of the largest size.

Naval Construction Battalion RN Royal Navy Seabees USN United States Navy armada bark boat bottom bottoms bucket coast guard craft division escadrille fleet flotilla hooker hulk hull keel leviathan line marine merchant fleet merchant marine merchant navy mosquito fleet naval forces naval militia naval reserve navy packet ship shipping ships squadron task force task group tonnage tub vessel watercraft whaling fleet