pile up vs store

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

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

As verbs, store is a hypernym of pile up; that is, store is a word with a broader meaning than pile up:

Other hypernyms of pile up include hive away, lay in, put in, salt away, stack away, stash away.

pile up (noun)	store (noun)
	a mercantile establishment for the retail sale of goods or services
	a depository for goods
	an electronic memory device
	a supply of something available for future use

pile up (verb)	store (verb)
increase in amount by collecting or gathering	keep or lay aside for future use
arrange into piles or stacks	find a place for and put away for storage
get or gather together