Druid vs magus

Druid

noun
  • A member of a benefit society founded in 1781, the Ancient Order of Druids. 

magus

noun
  • A magician; (derogatory) a conjurer or sorcerer, especially one who is a charlatan or trickster. 

  • A Zoroastrian priest. 

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