easiness vs simpleness

easiness and simpleness both are nouns.

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

As nouns, easiness and simpleness are synonyms defined as:

Other synonyms of easiness include ease, simplicity.

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