What is the verb form for peace?

There isn't a direct verb form for "peace". However, depending on the context, you could use these verbs:

* Pacify: to calm or soothe someone or something.

* Reconcile: to restore friendly relations.

* Mediate: to act as a go-between in a dispute.

* Harmonize: to bring into agreement or harmony.

* Appease: to pacify or satisfy, often by giving in to demands.

* Tranquilize: to make calm and peaceful.

The best verb to use will depend on the specific situation and what you want to convey.