epidemic vs explosion

epidemic

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. 

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

explosion

noun
  • A sudden uncontrolled increase. 

  • A sudden outburst. 

  • A violent release of energy (sometimes mechanical, nuclear, or chemical.) 

  • A bursting due to pressure. 

  • The sound of an explosion. 

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