dogfish vs seadog

dogfish

noun
  • a kitefin shark, any shark from family Dalatiidae 

  • Ginglymostoma cirratum 

  • especially those from the family Squalidae 

  • a catshark, any shark from family Scyliorhinidae 

  • 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 

seadog

noun
  • A dogfish. 

  • A charge resembling the talbot but with scales, webbed feet and a broad tail. 

  • A sailor accustomed to the sea. 

  • An omen of bad luck. 

  • A white-topped wave in an estuary. 

  • A pirate. 

  • A fogbow, as seen my mariners. 

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