come across vs run into

come across and run into both are verbs.

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

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

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

come across (verb)	run into (verb)
be received or understood	collide violently with an obstacle
communicate the intended meaning or impression	hit against; come into sudden contact with
come together	come together
be perceived in a certain way; make a certain impression	be beset by
find unexpectedly