Is “Mamma” a Scrabble word?
Yes
MAMMA
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 Mamma
/ˈmæmə/
noun
1.The milk-secreting organ of female humans and other mammals which includes the mammary gland and the nipple or teat; a breast; an udder. (plural: mammae)
2.An accessory cloud like a mammary in appearance, which can form on the underside of most cloud genera