insolubility vs unsolvability

insolubility and unsolvability both are nouns.

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

As nouns, insolubility and unsolvability are synonyms defined as:

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

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