macerator vs shredder

macerator

noun
  • A machine that reduces solids to small pieces. 

shredder

noun
  • A machine that tears up objects into smaller pieces, especially a paper shredder, garbage shredder or gardening or farming shredder. 

  • One who shreds, or plays (especially the guitar) very fast. 

  • A program that overwrites deleted data to prevent recovery. 

  • Someone who snowboards; a snowboarder. 

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