Microsoft Word on a Mac computer includes an AutoRecovery option. This is turned on by default when you install Word on OS X so that the app will automatically save a copy of an open document every 10 minutes. If Word freezes while you're working on a file, or if the computer crashes, you can find and use the AutoRecovery copy after you restart Word. This is a way to recover work you haven't saved, up to the point of Word's last automatic save.
Press "Command" and "N" simultaneously to open a new Finder window on the Mac's screen. In the left pane, under devices, choose the entire computer as the location to search. Enter "AutoRecovery" in the Search field.
Select the file you want from the list of files returned by the search. The names of auto-recovered files begin with "AutoRecovery save of" followed by the same name as the Word document that was lost.
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Double-click the recovered file. The file is opened in Microsoft Word.
Click the "File" menu and select "Save As." Type a new name for the file into the "Name" field at the top of the dialog box that appears on the screen. Select a folder for the file and click the "Save" button.