behaviour vs easiness

behaviour and easiness both are nouns.

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

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

behaviour (noun)	easiness (noun)
manner of acting or controlling yourself	the quality of being easy in behavior or style
(psychology) the aggregate of the responses or reactions or movements made by an organism in any situation	freedom from difficulty or hardship or effort
(behavioral attributes) the way a person behaves toward other people	a feeling of refreshing tranquility and an absence of tension or worry
the action or reaction of something (as a machine or substance) under specified circumstances