exchangeability vs exchangeable

exchangeability is a noun but exchangeable is not a noun.

Word	Noun	Adjective	Verb	Adverb
exchangeability	Yes	No	No	No
exchangeable	No	Yes	No	No

exchangeability (noun)	exchangeable (noun)
the quality of being capable of exchange or interchange

exchangeability (adjective)	exchangeable (adjective)
	suitable to be exchanged
	capable of being exchanged for or replaced by something of equal value
	capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability