debris vs offal

debris

noun
  • Litter and discarded refuse. 

  • Large rock fragments left by a melting glacier etc. 

  • Rubble, wreckage, scattered remains of something destroyed. 

  • The ruins of a broken-down structure. 

offal

noun
  • That which is thrown away as worthless or unfit for use; refuse; rubbish. 

  • A dead body; carrion. 

  • The internal organs of an animal, used as food. 

  • A by-product of the grain milling process, which may include bran, husks, etc. 

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