palliation vs reduction

palliation and reduction both are nouns.

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

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

palliation: 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 palliation include decrease, diminution, step-down.

palliation (noun)	reduction (noun)
easing the severity of a pain or a disease without removing the cause	the act of decreasing or reducing something
to act in such a way as to cause an offense to seem less serious	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