A cruise ship is a large passenger vessel used for pleasure voyages, typically with destinations in warm climates. ASEA is a four letter word that refers to a cruise ship being at sea. A LINER is a five letter word that refers to a large passenger ship that operates on a regular schedule between two or more ports. A luxuryliner is an eleven letter word that refers to a large, luxurious cruise ship that offers amenities such as spas, casinos, and fine dining.