Is “Ganister” a Scrabble word?
Yes
GANISTER
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 Ganister
/ɡænɪstə(ɹ)/
noun
1.A hard, fine-grained sandstone, used in manufacturing silica bricks for lining furnaces.