potentiality vs incapable

potentiality is a noun but incapable is not a noun.

Word	Noun	Adjective	Verb	Adverb
potentiality	Yes	No	No	No
incapable	No	Yes	No	No

potentiality (noun)	incapable (noun)
an aptitude that may be developed
the inherent capacity for coming into being

potentiality (adjective)	incapable (adjective)
	(followed by `of') lacking capacity or ability
	(followed by `of') not having the temperament or inclination for
	not meeting requirements
	not being susceptible to or admitting of something (usually followed by `of')