latrine vs shitpot

latrine

noun
  • An open trench or pit used for urination and defecation. 

  • Any facility or device used for urination or defecation, whether toilet, lavatory, or outhouse. 

shitpot

noun
  • A chamber pot or toilet. 

  • Term of abuse. 

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