chunk vs amass

chunk is a noun but amass is not a noun.

Word	Noun	Adjective	Verb	Adverb
chunk	Yes	No	Yes	No
amass	No	No	Yes	No

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

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

chunk (noun)	amass (noun)
a compact mass
a substantial amount

chunk (verb)	amass (verb)
group or chunk together in a certain order or place side by side	increase in amount by collecting or gathering
put together indiscriminately	get or gather together