A commuter is someone who travels regularly from one place to another, usually for work. The term can be broken down into five parts: a PASSENGER (9 letters), a RIDER (5 letters), RAIL (4 letters), BUS (3 letters), and laptop (6 letters). A PASSENGER is someone who travels in a vehicle, such as a car, train, or plane. A RIDER is someone who travels on an animal, such as a horse or bicycle. RAIL refers to the use of a train for transportation. BUS is a form of public transportation that runs on a fixed route. Finally, a laptop is a portable computer that can be used while traveling.