central vs inner

central is a noun but inner is not a noun.

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

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

central (adjective)	inner (adjective)
in or near a center or constituting a center; the inner area	located or occurring within or closer to a center
serving as an essential component	exclusive to a center; especially a center of influence
	inside or closer to the inside of the body
	innermost or essential
	located inward
	confined to an exclusive group