important vs significance

important is not a noun while significance is a noun.

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

important (noun)	significance (noun)
	the quality of being significant
	a meaning that is not expressly stated but can be inferred
	the message that is intended or expressed or signified

important (adjective)	significance (adjective)
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