peacekeeper has definitions from the fields of arms,military,work
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

*