flooding vs spillover

flooding

noun
  • An act of flooding; a flood or gush. 

  • A form of therapy that treats a phobia by suddenly exposing the patient to the object of the phobia, instead of approaching it gradually. 

  • Emotional overwhelm sometimes leading to a primal state of rage or panic. 

spillover

noun
  • That which overflows; the excess or side effect. 

  • The spread of infectious disease between different species of animal and particularly to humans. 

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