pile up vs corral

pile up is not a noun while corral is a noun.

Word	Noun	Adjective	Verb	Adverb
pile up	No	No	Yes	No
corral	Yes	No	Yes	No

As verbs, corral is a hyponym of pile up; that is, corral is a word with a more specific, narrower meaning than pile up:

Other hyponyms of pile up include run up, collect, pull in, come up, scrape, scrape up, scratch, chunk, lump, bale, catch, fund, fund.

pile up (noun)	corral (noun)
	a pen for cattle

pile up (verb)	corral (verb)
increase in amount by collecting or gathering	enclose in a corral
arrange into piles or stacks	arrange wagons so that they form a corral
get or gather together	gather and secure