smartness vs brightness

smartness and brightness both are nouns.

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

As nouns, smartness and brightness are synonyms defined as:

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

Other synonyms of smartness include cleverness.

smartness (noun)	brightness (noun)
elegance by virtue of being fashionable	the location of a visual perception along a continuum from black to white
liveliness and eagerness	the quality of being luminous; emitting or reflecting light
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