look up vs refer

look up and refer both are verbs.

Word	Noun	Adjective	Verb	Adverb
look up	No	No	Yes	No
refer	No	No	Yes	No

As verbs, look up and refer are synonyms defined as:

Other synonyms of look up include consult.

look up (verb)	refer (verb)
seek information from	think of, regard, or classify under a subsuming principle or with a general group or in relation to another
	have as a meaning
	make reference to
	use a name to designate
	seek information from
	send or direct for treatment, information, or a decision
	be relevant to