chunk vs accumulate

chunk is a noun but accumulate is not a noun.

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

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

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

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

chunk (verb)	accumulate (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