Here are some other terms that might be used, depending on the specific type of introduction:
* Foreword: Written by someone other than the author, often an expert in the field or a friend of the author.
* Introduction: A general overview of the book's content and purpose.
* Prologue: A story or event that takes place before the main narrative.
* Acknowledgments: A section thanking those who helped the author with the book.
The specific term used will depend on the style and purpose of the book.