easiness vs quietude

easiness and quietude both are nouns.

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

As nouns, quietude is a hypernym of easiness; that is, quietude is a word with a broader meaning than easiness:

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

Other hypernyms of easiness include quietness, tranquility, tranquillity.

easiness (noun)	quietude (noun)
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