powerful vs powerfulness

powerful is not a noun while powerfulness is a noun.

Word	Noun	Adjective	Verb	Adverb
powerful	No	Yes	No	Yes
powerfulness	Yes	No	No	No

powerful (noun)	powerfulness (noun)
	possession of controlling influence

powerful (adjective)	powerfulness (adjective)
having great power or force or potency or effect
having great influence
displaying superhuman strength or power
(of a person) possessing physical strength and weight; rugged and powerful
strong enough to knock down or overwhelm

powerful (adverb)	powerfulness (adverb)
(Southern regional intensive) very; to a great degree