Right-click the application button in the taskbar, and choose the CLOSE WINDOW item. The WORD window will close and the WORD application button will disappear from the task bar.
Closing WORD from the task bar, steps:
Right-click the application button in the taskbar.
The shortcut menu will open.
Choose the CLOSE item.
The WORD application window will close.
The WORD application button in the taskbar will disappear.