There are numerous synonyms for the word "prayer book." One of the most common is "missal," which specifically refers to a Catholic prayer book. Other synonyms include "hymnal," which contains a collection of hymns and prayers, and "psalter," which is a book containing the Psalms. Other terms that may be used to describe a prayer book include "devotional," "liturgical," and "ritual." Some religious traditions may also use specific terms for their prayer books, such as the "Siddur" in Judaism or the "Book of Common Prayer" in Anglicanism. Regardless of the name, a prayer book is an important tool for individuals and communities to connect with their faith and spirituality.