diarrhea vs runs

diarrhea

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

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

runs

noun
  • Diarrhea/diarrhoea. 

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