solubility vs definite quantity

solubility and definite quantity both are nouns.

Word	Noun	Adjective	Verb	Adverb
solubility	Yes	No	No	No
definite quantity	Yes	No	No	No

As nouns, definite quantity is a hypernym of solubility; that is, definite quantity is a word with a broader meaning than solubility:

solubility: the quantity of a particular substance that can dissolve in a particular solvent (yielding a saturated solution)
definite quantity: a specific measure of amount

solubility (noun)	definite quantity (noun)
the quality of being soluble and easily dissolved in liquid	a specific measure of amount
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)