declassify vs declassification

declassify is not a noun while declassification is a noun.

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

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

declassify (verb)	declassification (verb)
lift the restriction on and make available again