Cases of word usage

1) a police officer (cop)

2) a person who is detained (especially by the police etc as a suspect) (detainee)

3) a police officer whose job is to investigate a crime (detective)

4) to send a person (from the country where he or she is living) to the police in a country where he or she is said to have committed a crime (extradite)

5) a hard covering for the head as worn by motorcyclists, soldiers, police etc (helmet)

6) a person appointed to command others in the armed forces, the police force etc; a person with a (public) position of authority (officer)

7) a surprise attack made by troops, ship(s) or aircraft; a sudden visit by police to make arrests; a sudden attack for the purpose of stealing money (raid)

8) a long, high sound; to report a person to the police (squeal)

9) to give up (oneself, a ship, a town, etc) to the enemy, the police etc (surrender)