curiosity vs otaku

curiosity

noun
  • A unique or extraordinary object which arouses interest. 

  • Inquisitiveness; the tendency to ask and learn about things by asking questions, investigating, or exploring. 

otaku

noun
  • One with an obsessive interest in something, particularly (originally derogatory) obsessive Japanese fans of anime or manga. 

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