run up vs amass

run up and amass both are verbs.

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

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

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

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