derringer vs uzi

derringer

noun
  • A type of very small, concealable pistol with one or two barrels, but without any loading system or magazine. 

uzi

noun
  • A type of compact submachine gun, having a caliber of 9 millimeters with ammunition housed in the grip of the weapon. 

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