Final answer:
Guide words in a dictionary serve as alphabetical navigation aids that help users locate specific words quickly and easily.
Step-by-step explanation:
Guide words in a dictionary serve as alphabetical navigation aids. They help users quickly locate the word they are looking for by indicating the first and last word on a page. These words are placed at the top of each dictionary page and are typically in alphabetical order. Guide words play a crucial role in saving time and effort when searching for a specific word in a dictionary.