link up vs cogitate

link up and cogitate both are verbs.

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

As verbs, cogitate is a hypernym of link up; that is, cogitate is a word with a broader meaning than link up:

link up: make a logical or causal connection
cogitate: use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments

Other hypernyms of link up include cerebrate, think.

link up (verb)	cogitate (verb)
make a logical or causal connection	use or exercise the mind or one's power of reason in order to make inferences, decisions, or arrive at a solution or judgments
connect, fasten, or put together two or more pieces	consider carefully and deeply; reflect upon; turn over in one's mind
be or become joined or united or linked