knowledgeableness vs knowledgeable

knowledgeableness is a noun but knowledgeable is not a noun.

Word	Noun	Adjective	Verb	Adverb
knowledgeableness	Yes	No	No	No
knowledgeable	No	Yes	No	No

knowledgeableness (noun)	knowledgeable (noun)
wisdom as evidenced by the possession of knowledge

knowledgeableness (adjective)	knowledgeable (adjective)
	highly educated; having extensive information or understanding
	thoroughly acquainted through study or experience
	alert and fully informed