Quiet
Part of speech: verb
Definition: To become quiet, silent, still, tranquil, calm. To cause someone to become quiet.
Part of speech: adjective
Definition: With little or no sound; denoting absence of disturbing noise. Having little motion or activity; calm. Not busy, of low quantity. Not talking much or not talking loudly; reserved.
Part of speech: noun
Definition: The absence of sound; quietness. the absence of movement; stillness, tranquility
Example sentence: The best cure for the body is a quiet mind.
Tranquillity
Part of speech: noun
Definition: the state of being tranquilthe absence of disturbance; peacefulnessthe absence of stress; serenitythe quality of calm such as that experienced in places with mainly natural features and activities, free from disturbance from manmade ones.
Example sentence: For me, the defender I respect the most is Giorgio Chiellini. He's one of the best defenders in the world. I really like the way he plays football on the pitch, the way he defends. He lives for the game. He transmits a sense of tranquillity to his team-mates. I have always admired his way to play.