furbish up vs darn

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

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

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

furbish up: restore by replacing a part or putting together what is torn or broken
darn: repair by sewing

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

furbish up (verb)	darn (verb)
restore by replacing a part or putting together what is torn or broken	repair by sewing