harpoon vs pikeman

harpoon

noun
  • A spearlike weapon with a barbed head used in hunting whales and large fish. 

  • A harmonica. 

verb
  • To shoot something with a harpoon. 

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 harpoon and pikeman occurred in a corpus of books? (source: Google Ngram Viewer )