Should I use "textbook" or "text book"?
Textbook is always correct. Text book is incorrectly used by people instead of the compound word 'textbook'. The plural form is 'textbooks'.
Examples of textbook in a sentence
And they're also in a pretty standard textbook order."- Cerulean Sins by Laurell K. Hamilton
He looked up from where he was torturing a page of his textbook.- A deeper sleep by Dana Stabenow
From what I remember, the Manson case was textbook disorganized crime.- Exit Strategy by Kelley Armstrong
Textbook asshole.He smiles.--Ever- My Dead Body by Charlie Huston