a member of a military force that is assigned (often with international sanction) to preserve peace in a trouble area.

a soldier first and foremost, one whose actions, we hope, will bring about and maintain relative peace

Peacekeepers are a militaristic organization in the fictional Farscape universe. Originally a law enforcement agency, Peacekeepers are now a military organization that employs their people as mercenary soldiers. For a price, they will serve as the military force for planets that lack one, though this arrangement usually is more advantageous to the Peacekeepers than to their "clients."

the pistol of a law officer in the old West.

one who protects the rights of others by peacefully enforcing the laws and rules we live by; e.g., the teacher on recess duty, the corner police officer, the umpire in a baseball game, even a comic book hero or shero. (Depending on the age and sophistication of your students, you may decide to let them develop their own definitions of Peacemakers as they participate in the classroom activities that follow).

Kohler's patented, factory-installed, battery-powered, seat-actuated flushing system, which initiates the flush cycle when the user simply lowers the seat lid.

Volunteer citizen maintaining order and investigating harassment cases

Person who avoids conflict at all cost, to the point of detrimental behavior.

someone who keeps peace; as, she's the peacekeeper in that family.