important vs chief

important is not a noun while chief is a noun.

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

important (noun)	chief (noun)
	a person who is in charge
	a person who exercises control over workers
	the head of a tribe or clan

important (adjective)	chief (adjective)
of great significance or value	most important element
of extreme importance; vital to the resolution of a crisis
important in effect or meaning
having or suggesting a consciousness of high position
having authority or ascendancy or influence