States of Being/Feelings:
* Tranquility
* Serenity
* Harmony
* Calm
* Quiet
* Stillness
* Rest
* Contentment
* Joy (in some contexts)
* Safety
* Security
* Comfort
Abstract Concepts:
* Harmony
* Unity
* Reconciliation
* Agreement
* Understanding
* Tolerance
* Acceptance
Places/Situations:
* Oasis
* Haven
* Sanctuary
* Retreat
* Paradise
* Utopia (idealized)
Other:
* Silence
* Absence of conflict
* Freedom from war
* Inner peace
* Peace of mind
* Peaceful coexistence
Note: The specific noun you choose will depend on the context and the specific nuance you want to convey. For example, "tranquility" might suggest a quiet stillness, while "harmony" might emphasize unity and agreement.