Book of Common Prayer vs psalter

Book of Common Prayer

name
  • The liturgy of the Church of England, first compiled by Thomas Cranmer in 1549 after the (Act of Uniformity). 

psalter

noun
  • Synonym of Book of Common Prayer, which prominently includes the Psalms. 

  • Synonym of Psalms, particularly when printed as a separate work from the Bible. 

  • Synonym of breviary, which arranges the Psalms for devotional recitation. 

  • A rosary with 150 beads, used for reciting the Psalms in Catholic editions of the Bible. 

How often have the words Book of Common Prayer and psalter occurred in a corpus of books? (source: Google Ngram Viewer )