indispensable vs dispensableness

indispensable is not a noun while dispensableness is a noun.

Word	Noun	Adjective	Verb	Adverb
indispensable	No	Yes	No	No
dispensableness	Yes	No	No	No

indispensable (noun)	dispensableness (noun)
	the quality possessed by something that you can get along without

indispensable (adjective)	dispensableness (adjective)
not to be dispensed with; essential
absolutely necessary; vitally necessary
unavoidable