dollarfish vs tusk

dollarfish

noun
  • Peprilus triacanthus, the American butterfish. 

tusk

noun
  • A fish, the torsk (Brosme brosme). 

  • A sharp point. 

  • One of a pair of elongated pointed teeth that extend outside the mouth of an animal such as walrus, elephant or wild boar, and which continue to grow throughout the animal's life. 

  • A tusk shell. 

  • The share of a plough. 

  • A small projection on a (tusk) tenon. 

  • A projecting member like a tenon, and serving the same or a similar purpose, but composed of several steps, or offsets, called teeth. 

verb
  • To dig up using a tusk, as boars do. 

  • To gore with the tusks. 

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