capableness vs capable

capableness is a noun but capable is not a noun.

Word	Noun	Adjective	Verb	Adverb
capableness	Yes	No	No	No
capable	No	Yes	No	No

capableness (noun)	capable (noun)
the quality of being capable -- physically or intellectually or legally
an aptitude that may be developed

capableness (adjective)	capable (adjective)
	(usually followed by `of') having capacity or ability
	(followed by `of') having the temperament or inclination for
	having the requisite qualities for
	have the skills and qualifications to do things well
	possibly accepting or permitting