classification vs declassification

classification and declassification both are nouns.

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

classification (noun)	declassification (noun)
the act of distributing things into classes or categories of the same type	reduction or removal by the government of restrictions on a classified document or weapon
restriction imposed by the government on documents or weapons that are available only to certain authorized people
the basic cognitive process of arranging into classes or categories
a group of people or things arranged by class or category