Spiritual vs clerical

Spiritual

noun
  • A member of a branch of the Franciscan order that advocated simple dress and renounced the owning of property. 

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 Spiritual and clerical occurred in a corpus of books? (source: Google Ngram Viewer )