Is “Brightest” a Scrabble word?
Yes
BRIGHTEST
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Brightest
/ˈbɹaɪtɪst/
adjective
1.Visually dazzling; luminous, lucent, clear, radiant; not dark.
“Could you please dim the light? It's far too bright.”
2.Having a clear, quick intellect; intelligent.
“He's very bright. He was able to solve the problem without my help.”
3.Vivid, colourful, brilliant.
“The orange and blue walls of the sitting room were much brighter than the dull grey walls of the kitchen.”