soluble vs solubility

soluble is not a noun while solubility is a noun.

Word	Noun	Adjective	Verb	Adverb
soluble	No	Yes	No	No
solubility	Yes	No	No	No

soluble (noun)	solubility (noun)
	the quality of being soluble and easily dissolved in liquid
	the property (of a problem or difficulty) that makes it possible to solve
	the quantity of a particular substance that can dissolve in a particular solvent (yielding a saturated solution)

soluble (adjective)	solubility (adjective)
(of a substance) capable of being dissolved in some solvent (usually water)
susceptible of solution or of being solved or explained