operative vs functioning

operative and functioning both are nouns.

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

operative (noun)	functioning (noun)
someone who can be employed as a detective to collect information and assist in criminal investigations	process or manner of functioning or operating
a person secretly employed in espionage for a government

operative (adjective)	functioning (adjective)
being in force or having or exerting force	performing or able to perform its regular function
relating to or requiring or amenable to treatment by surgery especially as opposed to medicine
(of e.g. a machine) performing or capable of performing
effective; producing a desired effect