come over vs come across

come over and come across both are verbs.

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

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

come over and come across: communicate the intended meaning or impression

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