Is “Mum” a Scrabble word?
Yes
MUM
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 Mum
/mʌm/
noun
1.Mother.
2.Ma'am; a term of respect for an older woman.