easiness vs behaviour

easiness and behaviour both are nouns.

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

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

Other hypernyms of easiness include behavior, conduct, doings.

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