cruiser

(noun) a car in which policemen cruise the streets; equipped with radiotelephonic communications to headquarters. Synonyms: police cruiser, patrol car, police car, prowl car, squad car.

(noun) a large fast warship; smaller than a battleship and larger than a destroyer.

(noun) a large motorboat that has a cabin and plumbing and other conveniences necessary for living on board. Synonyms: cabin cruiser, pleasure boat, pleasure craft.