Piece-Of-Mind-Peace-Of-Mind | Commonly Confused Words

Piece of mind

/piːs əv maɪnd/

A state of mental calmness and reassurance, free from worry.

/piːs əv maɪnd/

A feeling of being safe or calm without worry

Remember peace of mind with the word peace, which refers to tranquility and calmness.
Piece of mind includes piece, like part of something, although its commonly mistaken for peace of mind.'
Peace of mind involves mental tranquility, whereas piece of mind could suggest giving someone a piece of your thoughts or opinions, though this use is not standard.