important vs central

important is not a noun while central is a noun.

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

important (noun)	central (noun)
	a workplace that serves as a telecommunications facility where lines from telephones can be connected together to permit communication

important (adjective)	central (adjective)
of great significance or value	in or near a center or constituting a center; the inner area
of extreme importance; vital to the resolution of a crisis	serving as an essential component
important in effect or meaning
having or suggesting a consciousness of high position
having authority or ascendancy or influence