1. U can press Alt+F4
2.minimize the window, right click on the tab then click on
close.
3.u can choose the Cross sign at up right most corner.

1. U can press Alt+F4

2.minimize the window, right click on the tab then click on
close.

3.u can choose the Cross sign at up right most corner.

4.You can close word file by double-clicking icon which is
on left side of ur application title on title bar. 

5.close word by DOS

6.close word file using Task manager-> application tab(right
click and end task)

7. close word file using Task manager-> proccess tab (right
click and end proccess)

8> and last. properly shutdown will also close ur application.

First you have save the word file which you have done something.

Then press alt+f4 or close in taskbar or by pressng X sign
at right top of the screen