Is “Otaku” a Scrabble word?
Yes
OTAKU
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 Otaku
/əʊˈtɑːkuː/
noun
1.One with an obsessive interest in something, particularly anime or manga.