There is a city in Germany named Kassel, but I don't know if proper nouns are counted when considering such a question.
A homophone for a speck is "spec". A homophone for "trench around a castle" could be "moat".
speck:motetrench around a castle:moat
The answer is that there is no homophone for can, but can is a homonym.
The homophone for "hymn" is "him."
Your is a homophone of you're. In some dialects, yore is another homophone.
the homophone for stationery is stationary
The homophone for climate is clime.
The homophone for "stile" is "style."
The homophone for "ale" is "ail."
The homophone of "sell" is "cell."
The homophone is dense.
A homophone for stock is stalk.