tool

– noun
1. an implement, esp. one held in the hand, as a hammer, saw, or file, for performing or facilitating mechanical operations.
2. any instrument of manual operation.
3. the cutting or machining part of a lathe, planer, drill, or similar machine.
4. the machine itself.
5. anything used as a means of accomplishing a task or purpose.
6. a person manipulated by another for the latter's own ends; cat's-paw.
7. the design or ornament impressed upon the cover of a book.
8. a. a pistol or gun.
b. a pickpocket.