archangel vs divine messenger

archangel

noun
  • Synonym of angelica (“the garden herb”) 

  • A powerful angel that leads many other angels, but is still loyal to a deity, and often seen as belonging to a particular archangelical rank or order within a greater hierarchy of angels. (Judeo-Christian examples: Gabriel, Michael, Raphael, Uriel). 

divine messenger

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