archdeacon vs parson

archdeacon

noun
  • A senior administrative official in a diocese, just under the bishop, often in charge of an archdeaconry. As a title, it can be filled by either a deacon or priest. 

parson

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

  • A Protestant minister. 

  • A Roman Catholic priest of an independent parish church. 

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