pigsty vs rattrap

pigsty

noun
  • A dirty or very untidy place. 

  • An enclosure where pigs are kept. 

rattrap

noun
  • A dilapidated building, a place that is run down and unsanitary. 

  • A device (trap) used to catch rats. 

  • A difficult, entangling situation. 

  • A type of bicycle pedal made of metal with no rubber. 

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