peacekeeper
1. [ noun ] someone who keeps peace
Examples:

"she's the peacekeeper in that family"

Related terms: defender
2. [ noun ] (military,work) a member of a military force that is assigned (often with international sanction) to preserve peace in a trouble area
Related terms: soldier military
3. [ noun ] (arms) the pistol of a law officer in the old West
Related terms: pistol
Similar spelling:   peacekeeping