I'm German and residing in France. When I was asked the following question the only word which came into my mind was Gesäß.
Which German word contains the most ä, ö, ü, and ß in any variation?
Are there others which contain more than two Umlauts and ß's? Not "zusammengesetzte Substantive" please and only word from the Duden.
I hope this question is not too off-topic - however I reckon that this question is not very serious.