articulate vs speaking

articulate is not a noun while speaking is a noun.

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

articulate (noun)	speaking (noun)
	delivering an address to a public audience
	the utterance of intelligible speech

articulate (adjective)	speaking (adjective)
expressing yourself easily or characterized by clear expressive language	capable of or involving speech or speaking
consisting of segments held together by joints	capable of speech

articulate (verb)	speaking (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