simplicity vs easiness

simplicity and easiness both are nouns.

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

As nouns, simplicity and easiness are synonyms defined as:

Other synonyms of simplicity include ease, simpleness.

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