Is “Lighten” a Scrabble word?
Yes
LIGHTEN
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 Lighten
/ˈlaɪ.tən/
verb
1.To make brighter or clearer; to illuminate.
“to lighten an apartment with lamps or gas; to lighten the streets”
2.To become brighter or clearer; to brighten.
3.To burst forth or dart, as lightning; to shine with, or like, lightning; to flash.