easiness vs simplicity

easiness and simplicity both are nouns.

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

As nouns, easiness and simplicity are synonyms defined as:

Other synonyms of easiness include ease, simpleness.

easiness (noun)	simplicity (noun)
the quality of being easy in behavior or style	freedom from difficulty or hardship or effort
freedom from difficulty or hardship or effort	lack of ornamentation
a feeling of refreshing tranquility and an absence of tension or worry	the quality of being simple or uncompounded
	absence of affectation or pretense
	a lack of penetration or subtlety