dory vs jack mackerel

dory

noun
  • Any of several different families of large-eyed, silvery, deep-bodied, laterally compressed, and roughly discoid marine fish. 

  • A small flat-bottomed boat with pointed or somewhat pointed ends, used for fishing both offshore and on rivers. 

  • A wooden pike or spear about three metres (ten feet) in length with a flat, leaf-shaped iron spearhead and a bronze butt-spike (called a sauroter), which was the main weapon of hoplites in Ancient Greece. It was usually not thrown but rather thrust at opponents with one hand. 

jack mackerel

noun
  • Any of various edible fish, especially of genus Trachurus, but also genera Caranx, Acanthocybium and Euthynnus. 

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