Is “Chack” a Scrabble word?
Yes
CHACK
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 Chack
verb
1.To toss up the head frequently, as a horse to avoid the restraint of the bridle.