alleviation vs reduction

alleviation and reduction both are nouns.

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

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

alleviation: the act of reducing something unpleasant (as pain or annoyance)
reduction: the act of decreasing or reducing something

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

alleviation (noun)	reduction (noun)
the act of reducing something unpleasant (as pain or annoyance)	the act of decreasing or reducing something
the feeling that comes when something burdensome is removed or reduced	the act of reducing complexity
	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