Microsoft Word has several useful command line switches that can be used to start Word. These switches can be used to make Word run in a specific way or perform specific task - like if you want to start it in the Safe Mode without any addons.
Microsoft Word Command Line startup switches
To open a Word document using the switches in Windows 10/8/7, type winword.exe /x. Here “/x” is the switch.
To modify how Microsoft Office Word starts on a one-time basis, you can add switches to the Microsoft Windows Run command (Start menu).
The following is the list of switches for Microsoft Word:
If you plan to use a modified startup method frequently, you can create a shortcut on the Windows desktop, using these switches.
Source: KB210565.