cock-bawd vs mackerel

cock-bawd

noun
  • A man who runs a brothel; a pimp. 

mackerel

noun
  • Certain smaller edible fish, principally true mackerel and Spanish mackerel in family Scombridae, often speckled, 

  • typically Scomber scombrus in the British isles. 

  • Certain other similar small fish in families Carangidae, Gempylidae, and Hexagrammidae. 

  • A true mackerel, any fish of tribe Scombrini (Scomber spp., Rastrelliger spp.) 

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