articulateness vs articulate

articulateness is a noun but articulate is not a noun.

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

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

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

articulateness (verb)	articulate (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