black friar vs diocesan

black friar

noun

  • A member of the religious order of the Dominicans. 

diocesan

noun

  • An inhabitant of a diocese. 

  • The bishop of a diocese. 

adj

  • Pertaining to a diocese. 

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