eruption vs outbreak

eruption

noun
  • A violent ejection, such as the spurting out of lava from a volcano. 

  • A sudden release of pressure or tension. 

  • An infection of the skin resulting in a rash or blemishing. 

outbreak

noun
  • An outburst or sudden eruption, especially of violence and mischief. 

  • An eruption; the sudden appearance of a rash, disease, etc. 

  • Synonym of breakout (“escape from prison”) 

  • A sudden increase. 

verb
  • To burst out or break forth. 

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