exchangeable vs convertibility

exchangeable is not a noun while convertibility is a noun.

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

exchangeable (noun)	convertibility (noun)
	the quality of being exchangeable (especially the ability to convert a currency into gold or other currencies without restriction)

exchangeable (adjective)	convertibility (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