stack away vs store

stack away is not a noun while store is a noun.

Word	Noun	Adjective	Verb	Adverb
stack away	No	No	Yes	No
store	Yes	No	Yes	No

As verbs, stack away and store are synonyms defined as:

Other synonyms of stack away include hive away, lay in, put in, salt away, stash away.

stack away (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

stack away (verb)	store (verb)
keep or lay aside for future use	keep or lay aside for future use
	find a place for and put away for storage