Is “Castanet” a Scrabble word?
Yes
CASTANET
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 Castanet
/ˌkæs.tə.ˈnɛt/
noun
1.(chiefly in the plural) A single handheld percussion instrument consisting of a pair of concave shells joined on one edge by string.