avalanche vs snowpack

avalanche

noun
  • A large mass or body of snow and ice sliding swiftly down a mountain side, or falling down a precipice. 

  • A fall of earth, rocks, etc., similar to that of an avalanche of snow or ice. 

  • A sudden, great, or irresistible descent or influx; anything like an avalanche in suddenness and overwhelming quantity. 

verb
  • The shelf broke and the boxes avalanched the workers. 

  • To come down upon; to overwhelm. 

  • To descend like an avalanche. 

  • To propel downward like an avalanche. 

snowpack

noun
  • An accumulation of packed snow, usually the seasonal amount. 

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