What is the purpose of guide wordz?

The purpose of guide words is to help readers locate a word in a dictionary or other reference book. Guide words are the first and last words on each page of a dictionary or reference book. They tell the reader what words are on that page. For example, if the guide words on a page are "apple" and "banana," then all of the words on that page will be between "apple" and "banana" in alphabetical order.