link up vs articulate

link up is not an adjective while articulate is an adjective.

Word	Noun	Adjective	Verb	Adverb
link up	No	No	Yes	No
articulate	No	Yes	Yes	No

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

Other hyponyms of link up include syndicate, complect, interconnect, interlink.

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

link up (verb)	articulate (verb)
make a logical or causal connection	speak, pronounce, or utter in a certain way
connect, fasten, or put together two or more pieces	express or state clearly
be or become joined or united or linked	put into words or an expression
	provide with a joint
	unite by forming a joint or joints