obeah vs spellwork

obeah

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

  • A magician or witch doctor of the magic craft. 

  • 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. 

spellwork

noun
  • Any magical practice involving creating or casting spells, especially new enchantments or spells which are intricate or complex. 

  • The formula or formulation of one or more spells or enchantments; the individual parts constituting such a formulation; the inner workings or structure of a spell. 

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