bewitchment vs black magic

bewitchment

noun
  • The characteristic of being bewitched. 

black magic

noun
  • Magic derived from evil forces, as distinct from good or benign forces; or magic performed with the intention of doing harm. 

  • Occult or secret magic; magic (or, by extension/comparison, technology etc) that is mysterious, not known to or understood by many. 

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