Are there double consonants in German that differentiate between words? Like in Italian where for example, "casa" means house and "cassa" means box.
This question is related to the question "Is there a difference in pronunciation between “ist” and “isst”?" in which it was originally asked.
Yes, there are double consonants in German that differentiate between words.
You can look through this list of words with double consonants and search for more yourself. Happy hunting!
Bann vs. Bahn
Mitte vs. Miete
Pollen vs. Polen
Busse vs. Buße
bette vs. bete vs. bäte
Hölle vs. Höhle
fülle vs. fühle
The latter is taken from Vokalquantität at Wikipedia.