crapper vs shitpot

crapper

noun
  • A chamber pot or toilet, particularly (dated) a flush toilet by Thomas Crapper. 

  • A rapper, or a performer of rap music. 

  • A lavatory or outhouse. 

  • A half-glass of whiskey. 

shitpot

noun
  • A chamber pot or toilet. 

  • Term of abuse. 

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