The police department charged with patrolling harbours and waterways by boat.

(informal, derogatory) Any person or group crusading for a particular usage or omission within a language; also called language cops, tongue troopers.

A unit of the civil police who are specifically trained to serve duty on horseback. Their duties can be ceremonial, or often for crowd control, and to police areas of difficult access or wilderness areas.

A unit of a military organization whose duty is to police the organization. They are in charge of law enforcement on military property, and of military personnel.

A subgenre of crime fiction which portrays the activities of a police force as they investigate crimes. Unlike in other types of crime fiction, the perpetrator may be known at the outset of the story.

A unit of the police specifically trained to deal with rioting crowds. They use special equipment for personal defense as well as for crowd control and dispersal.

A dog trained and employed by the police to pursue suspects or sniff out contraband. / (dated) Synonym of German shepherd

(US) A register, maintained by the desk sergeant, of people arrested or brought in for questioning to a police station; (UK) charge sheet. / (US) A newspaper column publishing highlights therefrom.

A line, often marked with yellow tape, demarcating a crime or accident scene and which bystanders are not supposed to cross. / A line of police officers standing guard.

plural of police state