insolubility vs insoluble

insolubility is a noun but insoluble is not a noun.

Word	Noun	Adjective	Verb	Adverb
insolubility	Yes	No	No	No
insoluble	No	Yes	No	No

insolubility (noun)	insoluble (noun)
the quality of being insoluble and difficult to dissolve in liquid
the property (of a problem or difficulty) that makes it impossible to solve

insolubility (adjective)	insoluble (adjective)
	(of a substance) incapable of being dissolved
	admitting of no solution or explanation
	without hope of solution