leaf litter vs sow

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. 

sow

noun
  • A kind of covered shed, formerly used by besiegers in filling up and passing the ditch of a besieged place, sapping and mining the wall, etc. 

  • A mass of metal solidified in a mold. 

  • A sowbug. 

  • A female bear, she-bear. 

  • A contemptible, often fat woman. 

  • A female guinea pig. 

  • A channel that conducts molten metal to molds. 

  • A female pig. 

verb
  • To scatter over; to besprinkle. 

  • To scatter, disperse, or plant (seeds). 

  • To spread abroad; to propagate. 

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