Is “Wo” a Scrabble word?
Yes
WO
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 Wo
interjection
1.A falconer's call to a hawk.
2.A call to cause a horse to slow down or stop; whoa.