come across vs gather

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

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

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

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