cleaning vs epidemic

cleaning

noun
  • The afterbirth of cows, ewes, etc. 

  • The process of making something clean. 

epidemic

adj
  • Like or having to do with an epidemic; widespread. 

noun
  • An occurrence of a disease or disorder in a population at a frequency higher than that expected in a given time period; an episode of outbreak and subsequent high prevalence. 

  • A widespread disease that affects many individuals in a population. 

  • The spreading of an idea or belief amongst a population. 

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