What is another word for the notebook?

There are many alternatives to "notebook" depending on the context:

Formal:

* Journal

* Logbook

* Diary

* Ledger

* Composition book

Informal:

* Pad

* Scribbler

* Notepad

* Sketchbook

* Binder

* Spiral

Technical:

* Lab notebook

* Field notebook

The best word to use will depend on what the notebook is used for. For example, if you're writing about a scientist keeping track of their experiments, "lab notebook" would be the most appropriate term.