The term 'chair piece' can be broken down into two crossword solutions: SPLAT (5 letters) and SLAT (4 letters). SPLAT is a term used to describe the flat, thin pieces of wood or metal that are used to support the seat of a chair. SLAT is a term used to describe the thin, narrow strips of wood or metal that are used to support the back of a chair. Both SPLAT and SLAT are essential components of a chair, providing support and structure for the furniture.