The difference between Peace of mind and Peacefulness
When used as nouns, peace of mind means the absence of mental turmoil or anxiety, whereas peacefulness means the state of being peaceful.
check bellow for the other definitions of Peace of mind and Peacefulness
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Peace of mind as a noun (set phrase):
The absence of mental turmoil or anxiety.
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Peacefulness as a noun:
The state of being peaceful.