gather vs come across

gather is a noun but come across is not a noun.

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

gather (noun)	come across (noun)
the act of gathering something
sewing consisting of small folds or puckers made by pulling tight a thread in a line of stitching

gather (verb)	come across (verb)
increase in amount by collecting or gathering	be received or understood
increase or develop	communicate the intended meaning or impression
conclude from evidence	come together
assemble or get together	be perceived in a certain way; make a certain impression
draw together into folds or puckers	find unexpectedly
look for (food) in nature
draw and bring closer
collect in one place
get people together