Is “Whose” a Scrabble word?
Yes
WHOSE
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 Whose
/huːz/
pronoun
1.(interrogative) That or those of whom or belonging to whom.
“Several people have lost their suitcases. Whose have you found?”
2.(relative) That or those of whom or belonging to whom.
“This car is blocking the way, but Mr Smith, whose it is, will be here shortly.”