Schull

Etymology
The expected outcome of would be šūl in southern Moselle Franconian, and šōl in northern Moselle Franconian and Ripuarian. The actual vocalism, namely šōl in the very south, šul elsewhere, implies an Old High German form through (re-)adaptation to. This would also explain 🇨🇬 (see there).

Noun

 * 1)  school