Spiritual vs parson

Spiritual

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

parson

noun
  • A Protestant minister. 

  • An Anglican cleric having full legal control of a parish under ecclesiastical law; a rector. 

  • A Roman Catholic priest of an independent parish church. 

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