In my font, the Umlaut character is broken when viewing at 80% zoom in Word. It displays like
U but is in fact
I'm now looking for the correct term of what needs to be fixed. First I thought the font needs kerning, but it seems that's only for distances between letters.
I only need the name of the problem. I can then google for the rest.
From the comments it seems the question is unclear, so again in other words: I don't want to fix it in Word - I could just zoom to 100%. I want to fix it in the font by using an aspect or process of typography.