articulate vs articulateness

articulate is not a noun while articulateness is a noun.

Word	Noun	Adjective	Verb	Adverb
articulate	No	Yes	Yes	No
articulateness	Yes	No	No	No

articulate (noun)	articulateness (noun)
	the quality of being facile in speech and writing

articulate (adjective)	articulateness (adjective)
expressing yourself easily or characterized by clear expressive language
consisting of segments held together by joints

articulate (verb)	articulateness (verb)
speak, pronounce, or utter in a certain way
express or state clearly
put into words or an expression
provide with a joint
unite by forming a joint or joints