unsolvability vs insolubility

unsolvability and insolubility both are nouns.

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

As nouns, unsolvability and insolubility are synonyms defined as:

unsolvability and insolubility: the property (of a problem or difficulty) that makes it impossible to solve

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