bergylt vs hemdurgan

bergylt

noun
  • The rose fish, an edible red fish found in the North Atlantic, Sebastes norvegicus. 

  • The Ballan wrasse, Labrus bergylta another North Atlantic fish 

hemdurgan

noun
  • Rose fish (Sebastes norvegicus). 

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