The word from the list that best fits the definition of "provides chapter titles and subheadings" is "table of contents." A table of contents is a list of the chapters and sections of a book, along with the page numbers where each chapter or section begins. It is typically located at the beginning of the book and serves as a guide for navigating the book's content. The table of contents typically includes the titles of the main chapters and sections of the book, along with any subheadings or sub-sections, and provides a clear overview of the book's structure and organization. Other elements of a book, such as a glossary, index, title page, and appendix, do not typically include chapter titles and subheadings in the same way as a table of contents.