WordNet sense 1 (find unexpectedly):

attain, strike, fall upon, come across, chance on, chance upon, come upon, happen upon, light upon

WordNet sense 2 (discover or determine the existence, presence, or fact of):

find, notice, observe, detect

WordNet sense 3 (make known to the public information that was previously known only to a few people or that was meant to be kept a secret):

break, disclose, divulge, expose, impart, unwrap, reveal, expose, bring out, give away, let out, let on

WordNet sense 4 (identify as in botany or biology, for example):

describe, distinguish, identify, key, name, key out

WordNet sense 5 (get to know or become aware of, usually accidentally):

hear, learn, see, find out, pick up, get a line, get wind, get word