incapability vs incapableness

incapability and incapableness both are nouns.

Word	Noun	Adjective	Verb	Adverb
incapability	Yes	No	No	No
incapableness	Yes	No	No	No

As nouns, incapability and incapableness are synonyms defined as:

incapability and incapableness: the quality of not being capable -- physically or intellectually or legally

As nouns, incapability and incapableness are synonyms defined as:

incapability (noun)	incapableness (noun)
the quality of not being capable -- physically or intellectually or legally	the quality of not being capable -- physically or intellectually or legally
lack of potential for development	lack of potential for development