pintail vs policeman

pintail

noun
  • The end of a fastening pin or mandrel on a Huckbolt or pop rivet that is broken off when installation is complete. 

  • A pintail duck, a type of dabbling duck with a characteristic pointed tail. 

  • Any of various species of libellulid dragonfly of the genus Acisoma, endemic to Africa and Asia. 

  • A surfboard with a pointed back end. 

  • A pin-tailed snipe, Gallinago stenura. 

  • A northern pintail, Anas acuta, a dabbling duck of the northern hemisphere that has a long pointed tail. 

policeman

noun
  • A glass rod capped at one end with rubber, used in a chemistry laboratory for gravimetric analysis. 

  • Any skipper of the genus Coeliades. 

  • Synonym of enforcer 

  • A male police officer, sometimes used for any police officer regardless of gender. 

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