revamp vs mend

revamp is not a noun while mend is a noun.

Word	Noun	Adjective	Verb	Adverb
revamp	No	No	Yes	No
mend	Yes	No	Yes	No

As verbs, mend is a hypernym of revamp; that is, mend is a word with a broader meaning than revamp:

revamp: provide (a shoe) with a new vamp
mend: restore by replacing a part or putting together what is torn or broken

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

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

revamp (verb)	mend (verb)
to patch up or renovate; repair or restore	restore by replacing a part or putting together what is torn or broken
provide (a shoe) with a new vamp	heal or recover