indistinguishability vs indistinguishable

indistinguishability is a noun but indistinguishable is not a noun.

Word	Noun	Adjective	Verb	Adverb
indistinguishability	Yes	No	No	No
indistinguishable	No	Yes	No	No

indistinguishability (noun)	indistinguishable (noun)
exact sameness

indistinguishability (adjective)	indistinguishable (adjective)
	not capable of being distinguished or differentiated
	exactly alike; incapable of being perceived as different