operational vs operative

operational is not a noun while operative is a noun.

Word	Noun	Adjective	Verb	Adverb
operational	No	Yes	No	No
operative	Yes	Yes	No	No

operational (noun)	operative (noun)
	someone who can be employed as a detective to collect information and assist in criminal investigations
	a person secretly employed in espionage for a government

operational (adjective)	operative (adjective)
(military) of or intended for or involved in military operations	being in force or having or exerting force
pertaining to a process or series of actions for achieving a result	relating to or requiring or amenable to treatment by surgery especially as opposed to medicine
being in effect or operation	(of e.g. a machine) performing or capable of performing
fit or ready for use or service	effective; producing a desired effect