Blacktop is a type of pavement used for roads, driveways, and parking lots. It is made up of a combination of materials such as ASPHALT, TAR, and gravel. PAVE, which is four letters, is the process of laying down a surface such as blacktop. ASPHALT, which is seven letters, is a material used in the paving process. TAR, which is three letters, is also a material used in the paving process. Repave, which is six letters, is the process of resurfacing an existing paved surface.