This is the 929th most frequent Serbian word.
петровац
"Петровац" is a Serbian name often used for towns or villages, meaning "Peter's place" or "settlement associated with Peter."
In this sentence, 'петровац' refers to the proper noun of a geographical location, specifically a town.
Петровац је мали приморски град у Црној Гори.
Petrovac is a small coastal town in Montenegro.
In this sentence, 'Петровац' is used as a proper noun to denote someone's surname or nickname.
Мој пријатељ Петровац игра шах сваког викенда.
My friend Petrovac plays chess every weekend.
Here, 'Петровца' is in the genitive case, referring to something associated with or belonging to the town Petrovac.