mitigation vs decrease

mitigation and decrease both are nouns.

Word	Noun	Adjective	Verb	Adverb
mitigation	Yes	No	No	No
decrease	Yes	No	Yes	No

As nouns, decrease is a hypernym of mitigation; that is, decrease is a word with a broader meaning than mitigation:

mitigation: to act in such a way as to cause an offense to seem less serious
decrease: the act of decreasing or reducing something

Other hypernyms of mitigation include diminution, reduction, step-down.

As nouns, decrease is a hypernym of mitigation; that is, decrease is a word with a broader meaning than mitigation:

Other hypernyms of mitigation include diminution, reduction, step-down.

mitigation (noun)	decrease (noun)
to act in such a way as to cause an offense to seem less serious	the act of decreasing or reducing something
the action of lessening in severity or intensity	the amount by which something decreases
a partial excuse to mitigate censure; an attempt to represent an offense as less serious than it appears by showing mitigating circumstances	a change downward
	a process of becoming smaller or shorter

mitigation (verb)	decrease (verb)
	decrease in size, extent, or range
	make become smaller