gladius vs vibrissa

gladius

noun
  • A pen, a hard internal bodypart of certain cephalopods, made of chitin-like material. 

  • A Roman sword roughly two feet long. 

vibrissa

noun
  • Any similar feather near the mouth of some birds. 

  • The thick hairs found inside the nostrils of humans and other mammals. 

  • Any of the tactile whiskers on the nose of an animal such as a cat. 

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