accessibility vs available

accessibility is a noun but available is not a noun.

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

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

accessibility (adjective)	available (adjective)
	obtainable or accessible and ready for use or service
	convenient for use or disposal
	not busy; not otherwise committed