genius loci vs specter

genius loci

noun
  • The minor deity or spirit watching over a particular place. 

  • The spirit or atmosphere of a place, especially conceived as a source of artistic inspiration. 

specter

noun
  • A ghostly apparition, a phantom. 

  • Any of certain species of dragonfly of the genus Boyeria, family Aeshnidae. 

  • A threatening mental image. 

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