Blitz vs Holocaust

Blitz

name
  • The series of air raids launched on various cities in Great Britain by the German air force in 1940–41 during World War II. 

Holocaust

name
  • The systematic mass murder (genocide) of six million Jews perpetrated by Nazi Germany shortly before and during World War II. 

  • The systematic mass murder (democide) of eleven million people, namely six million Jews and five million others (including Romanis, Slavs, homosexuals, and people with physical and mental disabilities), perpetrated by Nazi Germany shortly before and during World War II. 

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