smart vs hurting

smart and hurting both are nouns.

Word	Noun	Adjective	Verb	Adverb
smart	Yes	Yes	Yes	No
hurting	Yes	No	No	No

As nouns, hurting is a hypernym of smart; that is, hurting is a word with a broader meaning than smart:

Other hypernyms of smart include pain.

smart (noun)	hurting (noun)
a kind of pain such as that caused by a wound or a burn or a sore	a symptom of some physical hurt or disorder

smart (adjective)	hurting (adjective)
showing mental alertness and calculation and resourcefulness
capable of independent and apparently intelligent action
quick and brisk
improperly forward or bold
characterized by quickness and ease in learning
painfully severe
elegant and stylish

smart (verb)	hurting (verb)
be the source of pain