gather vs run across

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

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

gather (noun)	run 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)	run across (verb)
increase in amount by collecting or gathering	come together
increase or develop
conclude from evidence
assemble or get together
draw together into folds or puckers
look for (food) in nature
draw and bring closer
collect in one place
get people together