devitalisation vs reduction

devitalisation and reduction both are nouns.

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

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

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

devitalisation (noun)	reduction (noun)
the act of reducing the vitality of something	the act of decreasing or reducing something
	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