unite vs articulate

unite is not an adjective while articulate is an adjective.

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

As verbs, articulate is a hyponym of unite; that is, articulate is a word with a more specific, narrower meaning than unite:

Other hyponyms of unite include syndicate, complect, interconnect, interlink.

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

unite (verb)	articulate (verb)
become one	speak, pronounce, or utter in a certain way
join or combine	express or state clearly
act in concert or unite in a common purpose or belief	put into words or an expression
bring together for a common purpose or action or ideology or in a shared situation	provide with a joint
have or possess in combination	unite by forming a joint or joints
be or become joined or united or linked