darning vs mend

darning and mend both are nouns.

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

As nouns, mend is a hypernym of darning; that is, mend is a word with a broader meaning than darning:

Other hypernyms of darning include fix, fixing, fixture, mending, repair, reparation.

darning (noun)	mend (noun)
the act of mending a hole in a garment with crossing threads	the act of putting something in working order again
	sewing that repairs a worn or torn hole (especially in a garment)

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