firearm vs pikeman

firearm

noun
  • A personal weapon that uses explosive powder to propel a projectile often made of lead. 

pikeman

noun
  • A soldier armed with a pike. 

  • A person who operates a turnpike. 

  • A miner who works with a pick. 

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