This is the 8901st most frequent Polish word.
serbowie
"Serbowie" means "Serbs" in English.
Here, 'Serbowie' refers to the people of Serbian nationality, used as a subject of the sentence to denote who (the Serbs) live in Serbia.
Serbowie mieszkają w Serbii.
The Serbs live in Serbia.
In this sentence, 'Serbów' is the genitive form of 'Serbowie,' indicating the people (Serbs) whom the speaker met at the conference.
Spotkałem kilku Serbów na konferencji.
I met some Serbs at the conference.
The word 'Serbowie' here is used as the subject to depict the comparison between people of Serbian nationality and those of Croatian nationality concerning the language differences.