phone book vs telephone book

phone book and telephone book both are nouns.

Word	Noun	Adjective	Verb	Adverb
phone book	Yes	No	No	No
telephone book	Yes	No	No	No

As nouns, phone book and telephone book are synonyms defined as:

phone book and telephone book: a directory containing an alphabetical list of telephone subscribers and their telephone numbers

Other synonyms of phone book include phonebook, telephone directory.

phone book (noun)	telephone book (noun)
a directory containing an alphabetical list of telephone subscribers and their telephone numbers	a directory containing an alphabetical list of telephone subscribers and their telephone numbers