leaf litter vs offal

leaf litter

noun
  • Dead plant material, such as fallen leaves, bark, and twigs, that has fallen to the ground and may be used by animals as habitat or for nest-building, eventually decomposing and releasing nutrients into the soil. 

offal

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

  • 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. 

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