jetsam vs wreckage

jetsam

noun
  • Articles thrown overboard from a ship or boat in order to lighten the load of a ship in distress. 

  • Discarded odds and ends. 

wreckage

noun
  • Something wrecked, especially the remains or debris of something which has been severely damaged or destroyed. 

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