brightness vs smartness

brightness and smartness both are nouns.

Word	Noun	Adjective	Verb	Adverb
brightness	Yes	No	No	No
smartness	Yes	No	No	No

As nouns, brightness and smartness are synonyms defined as:

brightness and smartness: intelligence as manifested in being quick and witty

Other synonyms of brightness include cleverness.

brightness (noun)	smartness (noun)
the location of a visual perception along a continuum from black to white	elegance by virtue of being fashionable
the quality of being luminous; emitting or reflecting light	liveliness and eagerness
intelligence as manifested in being quick and witty	intelligence as manifested in being quick and witty
	a kind of pain such as that caused by a wound or a burn or a sore