accumulate vs chunk

accumulate is not a noun while chunk is a noun.

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

As verbs, chunk is a hyponym of accumulate; that is, chunk is a word with a more specific, narrower meaning than accumulate:

Other hyponyms of accumulate include run up, corral, collect, pull in, come up, scrape, scrape up, scratch, lump, bale, catch, fund, fund.

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

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