flush toilet vs pisser

flush toilet

noun
  • A toilet that uses water to flush urine and feces through a pipe to another location, typically a sewer main in urban settings or a septic tank elsewhere. 

pisser

noun
  • A toilet or urinal. 

  • That which pisses, particularly a penis. 

  • A disappointing or frustrating situation or event. 

  • A pub. 

  • An extremely amusing person or thing. 

  • One who pisses. 

  • Someone or something impressive or remarkable. 

  • Synonym of piss clam 

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