From Word's Help file:

Print a list of shortcut keys

1. On the Tools menu, point to Macro, and then click Macros.
2. In the Macros in box, click Word commands.
3. In the Macro name box, click ListCommands.
4. Click Run.
5. In the List Commands dialog box, click Current menu and keyboard settings.
6. Click OK.
7. On the File menu, click Print.