amass vs run up

amass and run up both are verbs.

Word	Noun	Adjective	Verb	Adverb
amass	No	No	Yes	No
run up	No	No	Yes	No

As verbs, run up is a hyponym of amass; that is, run up is a word with a more specific, narrower meaning than amass:

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

amass (verb)	run up (verb)
increase in amount by collecting or gathering	pile up (debts or scores)
get or gather together	raise by using ropes and pulleys
	fasten by sewing; do needlework
	make by sewing together quickly
	accumulate, sometimes as a debt