Is “Subgroup” a Scrabble word?
Yes
SUBGROUP
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 Subgroup
noun
1.A group within a larger group; a group whose members are some, but not all, of the members of a larger group.
2.A subset H of a group G that is itself a group and has the same binary operation as G.
Synonyms: subset
verb
1.To divide or classify into subgroups