General peace:
* Peacemaker: someone who promotes peace
* Peacekeeping: the act of maintaining peace
* Peacetime: a period of peace
Peace related to specific areas:
* Peace treaty: a formal agreement to end a war
* Peace offering: a gesture meant to appease someone
* Peace of mind: a state of mental calmness
Other options:
* Peacefulness: the quality of being peaceful
* Peaceful: calm and tranquil
The best option for you depends on the context and the specific meaning you wish to convey.