shrewd vs smart

shrewd is not a noun while smart is a noun.

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

shrewd (noun)	smart (noun)
	a kind of pain such as that caused by a wound or a burn or a sore

shrewd (adjective)	smart (adjective)
acting with a specific goal	showing mental alertness and calculation and resourcefulness
marked by practical hardheaded intelligence	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

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