powerfulness vs powerful

powerfulness is a noun but powerful is not a noun.

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

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

powerfulness (adjective)	powerful (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

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