Is “Textbook” a Scrabble word?
Yes
TEXTBOOK
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 Textbook
/ˈtɛkst.bʊk/
noun
1.A coursebook, a formal manual of instruction in a specific subject, especially one for use in schools or colleges.
adjective
1.Of or pertaining to textbooks or their style, especially in being dry and pedagogical; textbooky, textbooklike.
2.Having the typical characteristics of some class of phenomenon, so that it might be included as an example in a textbook.