flintlock vs pom-pom

flintlock

noun
  • An early type of firearm, using a spring-loaded flint to strike sparks into the firing pan. 

  • A type of lock used on muskets, rifles, and pistols from the early 17th to the mid-19th century. 

pom-pom

noun
  • A rapid-firing small-calibre cannon used especially as an anti-aircraft gun. 

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