darn vs run up

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

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

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

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