This is the 7446th most frequent Swedish word.
sommen
"Sommen" is the name of a lake in Sweden.
Here, 'sommen' refers to the name of a lake and is treated as a proper noun.
Sommen är en vacker sjö i Sverige.
Sommen is a beautiful lake in Sweden.
In this sentence, 'Sommen' is used as the name of a body of water where the fish are swimming.
Fiskarna simmar runt i Sommen.
The fish are swimming around in Sommen.
Here, 'Sommen' is again used to signify the specific lake, and is part of the prepositional phrase 'på Sommen', indicating the location where the activity takes place.