declassification vs reduction

declassification and reduction both are nouns.

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

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

declassification: reduction or removal by the government of restrictions on a classified document or weapon
reduction: the act of decreasing or reducing something

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

declassification (noun)	reduction (noun)
reduction or removal by the government of restrictions on a classified document or weapon	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