episcopal vs hierarchical

episcopal

adj
  • Of or relating to the affairs of a bishop in various Christian churches. 

hierarchical

adj
  • Of or pertaining to an ecclesiastic or priestly order. 

  • Pertaining to a hierarchy. 

  • Classified or arranged according to various criteria into successive ranks or grades. 

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