mend vs darn

mend and darn both are nouns.

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

As nouns, mend and darn are synonyms defined as:

mend and darn: sewing that repairs a worn or torn hole (especially in a garment)

Other synonyms of mend include patch.

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

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

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

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