Synonyms for Look up:

n.

come over, pay someone/something a visit/call, see, go around, swing by, look-in, call, call on, drop by, visit. jump, ease off, pick up, change for the better/worse, sharpen, recover, catch up, come a long way. dig, delve, look into, scout, investigate, gather, check up on, follow up. advance, progress, improve. discover, find, research, search, come upon, seek. look up (noun)
consult, refer.

v.

communication (verb)
consult, refer.
improve (verb)
advance, pick up, progress.
research (verb)
discover, come upon, find, seek.

Other synonyms:

delve, ease off, investigate, look into, check up on, seek. improve, visit. catch up, research, recover. scout. dig, follow up. gather. call. pick up. see. find
discover.
improve
recover.
visit
call on.
Other relevant words:
come upon, progress, drop by, search, advance, find, recover, seek, call, see, improve, research, come over, visit, discover.