quietness vs easiness

quietness and easiness both are nouns.

Word	Noun	Adjective	Verb	Adverb
quietness	Yes	No	No	No
easiness	Yes	No	No	No

As nouns, easiness is a hyponym of quietness; that is, easiness is a word with a more specific, narrower meaning than quietness:

quietness: a state of peace and quiet
easiness: a feeling of refreshing tranquility and an absence of tension or worry

Other hyponyms of quietness include ataraxis, heartsease, peace, peace of mind, peacefulness, repose, serenity, relaxation.

quietness (noun)	easiness (noun)
the property of making no sound	the quality of being easy in behavior or style
a state of peace and quiet	freedom from difficulty or hardship or effort
	a feeling of refreshing tranquility and an absence of tension or worry