Synonyms for Come across:

n.

locate, dig out, stumble across, track down, trace, map, come-on. come through, come out, something expresses itself, come at, pass, confront, come in. uncover. hand over, deliver, give, part with, pay. come across (noun)
come over, encounter, fall upon, ran into, chance upon, run across, meet, strike, attain, chance on, discover, resonate, see, light upon, come upon, happen upon.
to-do (noun)
enact, perform.

v.

encounter, find (verb)
discover, uncover, happen upon, chance upon, meet, light upon.

Other synonyms:

track down, locate, stumble across, come-on. dig out. map, confront, come at, come through. trace. come in. come out. pass. give
part with.
happen upon
come upon.
meet
chance on.
stumble
fall upon.
Other relevant words:
confront, chance upon, locate, track down, hand over, come upon, give, light upon, perform, happen upon, uncover, come through, deliver, pass.