This is the 12298th most frequent Swedish word.
serben
"The Serb" (a person from Serbia).
In this sentence, 'serben' is used as a noun referring to a person of Serbian nationality.
Serben lagar utsökt mat.
The Serbian cooks delicious food.
Here, 'serben' is used with a definite article to denote a specific Serbian individual.
Han har alltid varit nära vän med serben.
He has always been a close friend of the Serbian.
In this context, 'serben' simply denotes a person of Serbian descent.