overbold vs smart

overbold is not a noun while smart is a noun.

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

As adjectives, overbold and smart are synonyms defined as:

Other synonyms of overbold include fresh, impertinent, impudent, sassy, saucy, wise.

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

overbold (adjective)	smart (adjective)
improperly forward or bold	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

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