A smooth surface is a flat, EVEN surface that has been treated to be free of bumps and irregularities. The term can refer to a variety of materials, such as pavement, ICE, and metal. PAVE (4 letters), PLANE (5 letters), EVEN (4 letters), and ICE (3 letters) are all solutions to the crossword clue for the term 'a smooth surface'. Pavement is a hard surface made of concrete or asphalt, which is often used for roads and sidewalks. A PLANE is a tool used to make a surface flat and EVEN. EVEN is an adjective that describes something that is level and without variation. ICE is a frozen form of water that is naturally smooth and slippery.