There are many synonyms for the term "prayer service", depending on the occasion and context. Some common examples include worship service, devotional gathering, prayer meeting, spiritual gathering, congregational prayer, and religious ceremony. Other less common synonyms might include mass, liturgy, vespers, matins, or evensong. Each of these terms conveys a specific tone and emphasis, and may have different connotations depending on the particular religious tradition involved. Some terms may emphasize the communal aspect of prayer, while others may emphasize a more formal or solemn tone. Ultimately, the choice of synonyms for "prayer service" will depend on the particular context and purpose of the event.