chunk vs roll up

chunk is a noun but roll up is not a noun.

Word	Noun	Adjective	Verb	Adverb
chunk	Yes	No	Yes	No
roll up	No	No	Yes	No

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

Other hypernyms of chunk include accumulate, amass, collect, compile, hoard, pile up.

chunk (noun)	roll up (noun)
a compact mass
a substantial amount

chunk (verb)	roll up (verb)
group or chunk together in a certain order or place side by side	form a cylinder by rolling
put together indiscriminately	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