The difference between Calmness and Peace of mind
When used as nouns, calmness means the state of being calm, whereas peace of mind means the absence of mental turmoil or anxiety.
check bellow for the other definitions of Calmness and Peace of mind
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Calmness as a noun (uncountable):
The state of being calm; tranquillity; silence.
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Calmness as a noun (countable):
The product of being calm.
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Peace of mind as a noun (set phrase):
The absence of mental turmoil or anxiety.