lancetfish vs seawolf

lancetfish

noun
  • A voracious deep-sea fish in the genus Alepisaurus, having long, lancet-like teeth. 

seawolf

noun
  • A strong-jawed North Atlantic fish of wolffish family Anarhichadidae, Anarhichas lupus. 

  • Any of various dangerous people and animals that attack at sea. 

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