An ERASER is a classroom tool used to remove pencil marks from paper. It is six letters long and is often made of rubber or felt. A SHARPENER is also a classroom tool, used to sharpen pencils. It is nine letters long and usually consists of a metal blade and a receptacle for the shavings. A sharpeners is similar to a SHARPENER, but it is eight letters long and is used to sharpen other items such as knives and scissors.