furbish up vs mend

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

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

As verbs, furbish up and mend are synonyms defined as:

furbish up and mend: restore by replacing a part or putting together what is torn or broken

Other synonyms of furbish up include bushel, doctor, fix, repair, restore, touch on.

furbish up (noun)	mend (noun)
	the act of putting something in working order again
	sewing that repairs a worn or torn hole (especially in a garment)

furbish up (verb)	mend (verb)
restore by replacing a part or putting together what is torn or broken	restore by replacing a part or putting together what is torn or broken
	heal or recover