operative vs effective

operative is a noun but effective is not a noun.

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

operative (noun)	effective (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

operative (adjective)	effective (adjective)
being in force or having or exerting force	producing or capable of producing an intended result or having a striking effect
relating to or requiring or amenable to treatment by surgery especially as opposed to medicine	existing in fact; not theoretical; real
(of e.g. a machine) performing or capable of performing	able to accomplish a purpose; functioning effectively
effective; producing a desired effect	works well as a means or remedy
	ready for service
	exerting force or influence