amenable vs amenableness

amenable is not a noun while amenableness is a noun.

Word	Noun	Adjective	Verb	Adverb
amenable	No	Yes	No	No
amenableness	Yes	No	No	No

amenable (noun)	amenableness (noun)
	the trait of being cooperative

amenable (adjective)	amenableness (adjective)
disposed or willing to conform
liable to answer to a higher authority
responsive to suggestions and influences
open to being acted upon in a certain way