Other forms: misunderstandings
A misunderstanding is what happens when you don't comprehend something correctly. It's also another name for a disagreement, like the misunderstanding you and your sister had about whose turn it was to do the dishes.
The result of not clearly understanding someone or something is a misunderstanding. A misunderstanding between teammates can lead to dropped passes and lost points, and a misunderstanding of the pool rules can get you benched for doing a cannonball in the shallow end. You can also call a minor argument a misunderstanding.