central vs important

central is a noun but important is not a noun.

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

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

central (adjective)	important (adjective)
in or near a center or constituting a center; the inner area	of great significance or value
serving as an essential component	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