powerful vs ruling

powerful is not a noun while ruling is a noun.

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

powerful (noun)	ruling (noun)
	the reason for a court's judgment (as opposed to the decision itself)

powerful (adjective)	ruling (adjective)
having great power or force or potency or effect	exercising power or authority
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)	ruling (adverb)
(Southern regional intensive) very; to a great degree