Is “Ko” a Scrabble word?
Yes
KO
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 Ko
noun
1.(game of go) A local shape to which the ko rule applies; a ko shape.
“Black gets an easy game by just filling the ko.”
2.(game of go) ko fight
“Black wins the ko easily.”
3.(game of go) a stone in a ko in atari, a ko stone
“Black recaptures the ko and white has to find another ko threat.”