mend vs furbish up

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

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

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

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

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

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

mend (verb)	furbish up (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