HACK's vehicle is a term used to describe a TAXI, TAXICAB, or CAB. A TAXI is a four-letter word for a car that is hired with a driver to take passengers to their destination. A TAXICAB is a seven-letter word for a vehicle that is used to transport people for a fee. A CAB is a three-letter word for a vehicle that is hired to take passengers to their destination. All three terms refer to the same type of vehicle, which is typically used by a person who is in need of transportation.