This is the 8316th most frequent Spanish word.
policías
"Policías" means "police officers" or "police" in English.
In this sentence, 'policías' is used as a plural noun referring to police officers who are on duty.
Los policías patrullan las calles por las noches.
The police officers patrol the streets at night.
In this sentence, 'policías' again refers to a group of police officers working on an investigation.
He oído que hay un grupo de policías investigando el caso.
I heard there is a group of police officers investigating the case.
Here, 'policías' is used in a feminine plural form to refer to police forces or institutions responsible for law enforcement.