Word not launching

I have been using Word 2016 on my MacBook Air for over a year with no problems. Now, it won't launch - at all. When I click the icon to open it in the tool bar, it bounces to show it is opening as usual but then just stops and nothing happens. I've also tried opening a Word document through finder, but nothing happens.

However, if I try to remove the app, it says that Word is open and won't let me. So, my Mac thinks that Word is open, but nothing else shows that it is. If I right mouse click on the Word icon, it says that the application is not responding.

I have tried force quit and also rebooting, but it hasn't worked.

Any ideas?