operative vs important

operative is a noun but important is not a noun.

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

operative (noun)	important (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)	important (adjective)
being in force or having or exerting force	of great significance or value
relating to or requiring or amenable to treatment by surgery especially as opposed to medicine	of extreme importance; vital to the resolution of a crisis
(of e.g. a machine) performing or capable of performing	important in effect or meaning
effective; producing a desired effect	having or suggesting a consciousness of high position
	having authority or ascendancy or influence