accessible vs accessibility

accessible is not a noun while accessibility is a noun.

Word	Noun	Adjective	Verb	Adverb
accessible	No	Yes	No	No
accessibility	Yes	No	No	No

accessible (noun)	accessibility (noun)
	the quality of being at hand when needed
	the attribute of being easy to meet or deal with

accessible (adjective)	accessibility (adjective)
capable of being reached
easy to get along with or talk to; friendly
easily obtained
capable of being read with comprehension