Phonebook and Phone book

Phonebook noun - A directory containing an alphabetical list of telephone subscribers and their telephone numbers.

Phone book is a synonym for phonebook. In some cases you can use "Phone book" instead the word "Phonebook" as a noun or a verb.

Phone book noun - A directory containing an alphabetical list of telephone subscribers and their telephone numbers.

Phonebook is a synonym for phone book. You can use "Phonebook" instead a noun phrase "Phone book".