amenableness vs amenable

amenableness is a noun but amenable is not a noun.

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

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

amenableness (adjective)	amenable (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