A family of Microsoft word processing software products for creating web, email, and print documents.
Just to add to the "you appear to be the only one with this unique problem" assertion:
http://apple.stackexchange.com/questions/139199/always-show-text-cursor-while-moving-it-in-word
Different user, same problem, no solution either.
For your information.
And of course, more generally, a Google search:
disappearing cursor in word for Mac
returns plenty of hits (not just my stuff).
Pierre