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A submarine is a vessel designed for underwater navigation, typically used for military purposes or exploration. A boat is a small watercraft designed for travel on water, ranging from simple fishing boats to large cargo vessels. A warship is a heavily armed naval ship designed for combat, equipped with weaponry and armor. A cruiser is a fast, medium-sized warship, often used for long-range patrols and escort missions. A yacht is a luxurious recreational boat, often privately owned for leisure activities like sailing and cruising.