Is “Thunderflash” a Scrabble word?
Yes
THUNDERFLASH
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 Thunderflash
noun
1.A pyrotechnic device that generates a loud noise, used to simulate battlefield conditions.