Close Your Work
To close the Microsoft Word window, click the Close button 
in the upper right corner.
If you’ve made changes to the document since the last time you saved it, Word asks you if you want to save it now. Click Yes to save your changes, or click No to close the document without saving the changes.
Tip:
For each document you open, Microsoft Word opens another instance of the window. When you click the Close button, Word closes both the window and the document. If you want to close your document without closing the Microsoft Word window, click the document’s Close Window button, or open the File menu and select Close.
To close multiple documents at once and exit Microsoft Word, select Exit from the File menu.
