A family of Microsoft word processing software products for creating web, email, and print documents.
My colleague, Stefan, must have missed this one: Go to Word> Preferences> View then clear the check on Comments on Rollover.
In my experience the comment popup never covers the commented text, it always appears above it. But if you don't actually want to disable the feature there is no need to click, just press the esc key or move the pointer a bit so it doesn't hover on the commented content.