This is the 361st most frequent Polish word.
policjanci
"Policjanci" means "police officers" in English.
Here, 'policjanci' is the subject of the sentence, meaning 'police officers' to indicate individuals in this role participating in an action.
Policjanci patrolują ulicę w poszukiwaniu podejrzanych.
The police officers are patrolling the street looking for suspects.
'Policjanci' is part of the subject phrase describing a scene, referring to police officers as the individuals engaged in the dialogue.
Za rogiem stoi kilku policjantów rozmawiających z przechodniami.
Around the corner, several police officers are talking with passersby.
This usage implies 'policjanci' as the group of individuals conducting an investigation.