This is the 5759th most frequent Swedish word.
heidelberg
The word "heidelberg" is not Swedish; it refers to a German city.
Here, 'Heidelberg' is used as a proper noun to refer to the city of Heidelberg in Germany. It names the location of the university being discussed.
Jag studerade vid universitetet i Heidelberg.
I studied at the university in Heidelberg.
In this sentence, 'Heidelberg' functions as the name of the city being described, emphasizing its geographic and cultural significance.
Heidelberg är känd för sin pittoreska gamla stad och vackra omgivningar.
Heidelberg is known for its picturesque old town and beautiful surroundings.
'Heidelberg' is used again as a proper location noun, specifying the place the speaker intends to visit.