refer vs look up

refer and look up both are verbs.

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

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

Other synonyms of refer include consult.

refer (verb)	look up (verb)
think of, regard, or classify under a subsuming principle or with a general group or in relation to another	seek information from
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