blackfish vs nigger

blackfish

verb
  • To adopt signifiers of black identity (for example, by darkening the skin, or wearing traditionally black hairstyles). 

  • To go fishing for blackfish. 

noun
  • The Atlantic salmon, Salmo salar, especially a female after spawning. 

  • Any of various dark-coloured fish of the Old World, especially the rudderfish (Centrolophus niger). 

  • A pilot whale, genus Globicephalus (occasionally also used for various other whales). 

  • Any of various dark-coloured fishes of Australasia, especially the luderick, Girella tricuspidata, and a freshwater fish, Gadopsis marmoratus. 

  • Either of two dark-coloured fish of the west Atlantic, the tautog of New England (Tautoga onitis) and the black sea bass (Centropristis striata). 

nigger

verb
  • To behave as a stereotypical black person. 

  • To perform in blackface. 

  • To treat as inferior. 

noun
  • A person of any kind (particularly as a term of abuse). 

  • A fish, the luderick (Girella tricuspidata). 

  • A friend, particularly a fellow black person, often used as an informal term of address. 

  • A member of any typically dark-skinned people (now especially in combinations like prairie nigger or sand nigger). 

  • A person of black African descent who acts in an unapproved manner (whether positive or negative). 

  • A black person; a person of black African descent. 

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