Is “Castor” a Scrabble word?
Yes
CASTOR
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 Castor
/ˈkɑːs.tə/
noun
1.A hat made from the fur of the beaver.
2.A heavy quality of broadcloth for overcoats.
3.Castoreum (bitter exudate of mature beavers).