Is “Coset” a Scrabble word?
Yes
COSET
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 Coset
noun
1.The set that results from applying a group's binary operation with a given fixed element of the group on each element of a given subgroup.