An address book is a collection of names, addresses, and contact information for people in your network. However, there are many ways to describe this useful tool. For instance, you might use the word "contact list" to refer to a digital collection of contacts. Another common synonym is "phone book," which emphasizes the importance of phone numbers in maintaining connections. A third option is "directory," which suggests a more formal or business-oriented collection of contacts. No matter what you call it, an address book is a valuable resource for anyone who wants to keep in touch with friends, family, or colleagues. So whether you prefer "contact list," "phone book," or "directory," make sure you keep your information up to date and organized.