Quietness
Part of speech: noun
Definition: the absence of sound; silence or hush the absence of disturbance; calm, stillness or serenity
Example sentence: I went to visit Alcatraz years ago when I was on tour with the Pistols, and I really liked the atmosphere of the place. I genuinely, really, thoroughly enjoyed the whole morning there. I just liked the quietness and stillness of what is basically a cruel prison complex. I still found some kind of joy in that. That's how I am.
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: The happiness and peace attained by those satisfied by the nectar of spiritual tranquillity is not attained by greedy persons restlessly moving here and there.