fallout vs source

fallout

noun
  • A negative side effect; an undesirable or unexpected consequence. 

  • A declined offer in a sales transaction when acceptance was presumed. 

  • An impromptu guest used to fill in for another guest spot who is a no-show or who has cancelled last minute. 

  • The person who declines such an offer. 

  • The event of small airborne particles falling to the ground in significant quantities as a result of major industrial activity, volcano eruption, sandstorm, nuclear explosion, etc. 

  • The particles themselves. 

source

verb
  • To obtain or procure: used especially of a business resource. 

  • To find information about (a quotation)'s source (from which it comes): to find a citation for. 

noun
  • A reporter's informant. 

  • Source code. 

  • The name of one terminal of a field effect transistor (FET). 

  • Spring; fountainhead; wellhead; any collection of water on or under the surface of the ground in which a stream originates. 

  • The person, place, or thing from which something (information, goods, etc.) comes or is acquired. 

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