billfish vs garpike

billfish

noun
  • northern pipefish (Syngnathus fuscus, Syngnathidae) 

  • gars (Lepisosteidae) 

  • silver gar (Strongylura maritima, Belonidae) 

  • saury (Scomberesocidae) 

  • Any of several fish, of the families Istiophoridae and Xiphiidae, that have an elongated jaw. 

garpike

noun
  • A saltwater fish in the family Belonidae. 

  • A freshwater fish in the family Lepisosteidae. 

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