Is “Mo” a Scrabble word?
Yes
MO
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 Mo
adjective
1.Greater in amount, quantity, or number (of discrete objects, as opposed to more, which was applied to substances)
adverb
1.To a greater degree
2.Further, longer