alluvion vs bad news

alluvion

noun
  • The increase in the area of land due to the deposition of sediment (alluvium) by a river. 

bad news

noun
  • An irritating, troublesome or harmful person, situation or thing. 

  • News of unpleasant, unfortunate or sad events. 

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