Is “Tabbing” a Scrabble word?
Yes
TABBING
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 Tabbing
verb
1.To affix with tabs; to label.
verb
1.To use the Tab key on a computer to advance the cursor or move the input focus, or on a typewriter to advance the carriage.