Best way to see multiple Microsoft Word windows?
App Exposé
Trigger using swipe gesture:

System Preferences → Trackpad → More Gestures → App Exposé

Trigger using keys or mouse:

System Preferences → Mission Control



Dock Icon:

You can trigger App Exposé by right-clicking the Word icon in the Dock and choosing the option Show All Windows.

Alternatively you can cycle all Windows of the same application using:

⌘+~ (US keyboard layout)