Is “Workbook” a Scrabble word?
Yes
WORKBOOK
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 Workbook
noun
1.A book, used by a student, in which answers and workings may be entered besides questions and exercises.
2.A book, used by a business, containing a record of work to be done, or work completed.
3.A collection of spreadsheets stored in the same file.