dogfish vs mud shark

dogfish

noun

  • a catshark, any shark from family Scyliorhinidae 

  • Ginglymostoma cirratum 

  • especially those from the family Squalidae 

  • a kitefin shark, any shark from family Dalatiidae 

  • Scyliorhinus canicula or Scyliorhinus stellaris 

  • Squalus suckleyi 

  • Ginglymostoma cirratum or Mustelus canis 

  • Squalus acanthias, Squalus blainville, Squalus megalops, or Squalus mitsukurii 

  • Mustelus canis 

  • The bowfin, Amia calva. 

  • Scyliorhinus canicula 

  • Bodianus rufus 

mud shark

noun

  • Synonym of spiny dogfish 

  • A non-black person, usually a white woman, who has sexual relationships with black people, usually men. 

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