link up vs connect

link up and connect both are verbs.

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

As verbs, link up and connect are synonyms defined as:

Other synonyms of link up include associate, colligate, link, relate, tie in.

As verbs, link up and connect are synonyms defined as:

link up and connect: connect, fasten, or put together two or more pieces

Other synonyms of link up include link, tie.

As verbs, link up and connect are synonyms defined as:

Other synonyms of link up include join, link, unite.

link up (verb)	connect (verb)
make a logical or causal connection	make a logical or causal connection
connect, fasten, or put together two or more pieces	join for the purpose of communication
be or become joined or united or linked	join by means of communication equipment
	connect, fasten, or put together two or more pieces
	land on or hit solidly
	plug into an outlet
	hit or play a ball successfully
	establish communication with someone
	establish a rapport or relationship
	be or become joined or united or linked
	be scheduled so as to provide continuing service, as in transportation