easing vs diminution

easing and diminution both are nouns.

Word	Noun	Adjective	Verb	Adverb
easing	Yes	No	No	No
diminution	Yes	No	No	No

As nouns, diminution is a hypernym of easing; that is, diminution is a word with a broader meaning than easing:

Other hypernyms of easing include decrease, reduction, step-down.

easing (noun)	diminution (noun)
the act of reducing something unpleasant (as pain or annoyance)	the act of decreasing or reducing something
a change for the better	the statement of a theme in notes of lesser duration (usually half the length of the original)
	change toward something smaller or lower