Is “Coolth” a Scrabble word?
Yes
COOLTH
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 Coolth
/kuːlθ/
noun
1.The state of being cool, temperature-wise; coolness.