anus vs diarrhea

anus

noun
  • The lower orifice of the alimentary canal, through which feces and flatus are ejected. 

  • An impolite, unpopular, or unintelligent person. 

diarrhea

noun
  • The watery or very soft excrement that comes from such bowel movements. 

  • A gastrointestinal disorder characterized by frequent and very soft or watery bowel movements. 

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