necromancy vs obeah

necromancy

noun
  • Loosely, any sorcery or witchcraft, especially involving death or the dead, particularly sorcery involving raising or reanimating the dead. 

  • Synonym of necroposting 

  • Divination involving the dead or death. 

obeah

noun
  • A magician or witch doctor of the magic craft. 

  • A spell performed in the practice of the magic craft; an item associated with such a spell. 

  • A form of folk magic, medicine or witchcraft originating in Africa and practised in parts of the Caribbean. 

verb
  • To bewitch using this kind of folk magic. 

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