band aid vs mending

band aid and mending both are nouns.

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

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

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

band aid (noun)	mending (noun)
hurried repair	the act of putting something in working order again
	garments that must be repaired