Divine Office vs clerical

Divine Office

noun
  • Synonym of Liturgy of the Hours 

clerical

noun
  • Clerical garments. 

  • A member of the clergy. 

adj
  • Of or relating to the clergy. 

  • Of or relating to clerks or their work. 

How often have the words Divine Office and clerical occurred in a corpus of books? (source: Google Ngram Viewer )