cockatrice vs comfort woman

cockatrice

noun
  • A legendary creature about the size and shape of a dragon or wyvern, but in appearance resembling a giant rooster, with some lizard-like characteristics. 

  • A snake or serpent that appears to be hatched of a rooster, or cock's, egg. 

  • The cobra. 

comfort woman

noun
  • A woman forced, or supposedly recruited, into brothels by the Japanese occupation forces before or during World War II. 

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