discover vs come upon

discover and come upon both are verbs.

Word	Noun	Adjective	Verb	Adverb
discover	No	No	Yes	No
come upon	No	No	Yes	No

As verbs, discover and come upon are synonyms defined as:

Other synonyms of discover include attain, chance on, chance upon, come across, fall upon, happen upon, light upon, strike.

discover (verb)	come upon (verb)
get to know or become aware of, usually accidentally	take possession of
identify as in botany or biology, for example	find unexpectedly
make known to the public information that was previously known only to a few people or that was meant to be kept a secret
make a discovery, make a new finding
see for the first time; make a discovery
discover or determine the existence, presence, or fact of by perception with the eyes
find unexpectedly