Italian sandwich vs bomber

Italian sandwich

noun
  • A type of submarine sandwich consisting of French bread sliced lengthwise, filled with salami or ham with cheese and onion. 

bomber

noun
  • A person who sets bombs, especially as an act of terrorism. 

  • A military aircraft designed to carry and drop bombs. 

  • A 22-ounce beer bottle. 

  • A large cannabis cigarette. 

adj
  • Completely solid and secure, usually referring to some form of protective gear. 

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