Peace and contentment are two things (concepts) that generally go together. When you think of one, you will often think of the other. When you have one, you generally have the other. But the similarity between the two is more than a partnership or relationship. The similarity is their nature. True peace is inward. When you have peace, you have an inner calmness despite outer circumstances or condition. True contentment is inward. It deals with a satisfaction that is in us more so than a satisfaction with stuff, money, material possessions, etc. (outside conditions).