stack away vs roll up

stack away and roll up both are verbs.

Word	Noun	Adjective	Verb	Adverb
stack away	No	No	Yes	No
roll up	No	No	Yes	No

As verbs, roll up is a hyponym of stack away; that is, roll up is a word with a more specific, narrower meaning than stack away:

Other hyponyms of stack away include bin, computerise, computerize, victual, accumulate, amass, collect, compile, hoard, pile up, hive.

stack away (verb)	roll up (verb)
keep or lay aside for future use	form a cylinder by rolling
	form into a cylinder by rolling
	show certain properties when being rolled
	make into a bundle
	close (a car window) by causing it to move up, as with a handle
	arrive in a vehicle:
	get or gather together