A whittling tool is a KNIFE, which is a five-letter word. Whittling is the art of carving wood with a KNIFE or other sharp tool. It is a traditional craft that has been practiced for centuries and is still popular today. The most common type of whittling tool is a pocket KNIFE, which is used to carve intricate shapes and designs in wood. Other tools such as chisels, gouges, and rasps can also be used for whittling.