A thick piece is an object that is large and has a substantial amount of mass. The term can be used to describe a variety of objects, such as a SLAB (4 letters), a CHUNK (5 letters), or a HUNK (4 letters). A SLAB is a flat, rectangular piece of material, usually made of stone, wood, or metal. A CHUNK is a large, irregularly shaped piece of something, such as a rock or a block of ice. A HUNK is a large, solid piece of something, such as a piece of meat or a block of cheese.