mitigation vs reduction

mitigation and reduction both are nouns.

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

As nouns, reduction is a hypernym of mitigation; that is, reduction 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
reduction: the act of decreasing or reducing something

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

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

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

mitigation (noun)	reduction (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 act of reducing complexity
a partial excuse to mitigate censure; an attempt to represent an offense as less serious than it appears by showing mitigating circumstances	any process in which electrons are added to an atom or ion (as by removing oxygen or adding hydrogen); always occurs accompanied by oxidation of the reducing agent