This is the 3424th most frequent Polish word.
zabójcy
"Zabójcy" means "killers" or "murderers" in English.
The word 'zabójcy' is used as the nominative plural noun to indicate individuals carrying out assassinations.
Zabójcy wchodzą do budynku.
The assassins are entering the building.
The word 'zabójcy' is used here as a singular genitive form to describe possession or association, meaning belonging to 'murderer' or 'assassin'.
Policja poszukuje zabójcy.
The police are looking for the assassin.
In this case, 'zabójcy' is used in singular genitive form to indicate possession, as in 'of the assassin.'