run up vs darn

run up is not a noun while darn is a noun.

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

run up (noun)	darn (noun)
	sewing that repairs a worn or torn hole (especially in a garment)
	something of little value

run up (verb)	darn (verb)
pile up (debts or scores)	repair by sewing
raise by using ropes and pulleys
fasten by sewing; do needlework
make by sewing together quickly
accumulate, sometimes as a debt