chief vs important

chief is a noun but important is not a noun.

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

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

chief (adjective)	important (adjective)
most important element	of great significance or value
	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