ammunition vs harpoon

ammunition

verb
  • To supply with ammunition. 

noun
  • Articles used in charging firearms and ordnance of all kinds; as powder, balls, shot, shells, percussion caps, rockets, etc. 

  • Arguments and information that can be used against the other party in a conflict. 

harpoon

verb
  • To shoot something with a harpoon. 

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

  • A harmonica. 

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