band aid vs mend

band aid and mend both are nouns.

Word	Noun	Adjective	Verb	Adverb
band aid	Yes	No	No	No
mend	Yes	No	Yes	No

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

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

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

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