digger vs swaddy

digger

noun
  • A tool for digging. 

  • A spade (playing card). 

  • An Australian soldier. 

  • A large piece of machinery that digs holes or trenches. 

  • One who digs. 

swaddy

noun
  • A soldier, especially a militiaman. 

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