come across vs run across

come across and run across both are verbs.

Word	Noun	Adjective	Verb	Adverb
come across	No	No	Yes	No
run across	No	No	Yes	No

As verbs, come across and run across are synonyms defined as:

Other synonyms of come across include encounter, meet, run into, see.

come across (verb)	run across (verb)
be received or understood	come together
communicate the intended meaning or impression
come together
be perceived in a certain way; make a certain impression
find unexpectedly