Is “Untacks” a Scrabble word?
Yes
UNTACKS
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 Untacks
verb
1.To unfasten (something tacked).
2.To remove the tack from.