landslide vs plummeting

landslide

noun
  • A natural disaster that involves the breakup and downhill flow of rock, mud, water and anything caught in the path. 

  • A vote won by a wide or overwhelming majority. 

verb
  • To undergo a landslide. 

plummeting

noun
  • A violent or dramatic fall. 

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