The term 'FINISHING NAIL' is a type of nail used in carpentry and woodworking. It is typically small and has a flat head, which makes it ideal for finishing work. The crossword solution for this term is 'BRAD', which is a four-letter word. A BRAD is a type of nail that is similar to a finishing nail, but it has a smaller head and is usually made of thinner metal. It is often used for decorative purposes, such as attaching trim or molding.