succuba vs yaksha

succuba

noun
  • A female demon or fiend; a succubus. 

yaksha

noun
  • A kind of supernatural being; can be a malevolent demon or a beneficent tutelary deity. 

  • A kind of supernatural being, often depicted as having supernatural power, great strength, and frightening appearance; can be a malevolent demon or a beneficent tutelary deity. 

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