abomasum vs mater

abomasum

noun
  • The fourth or digestive compartment of the stomach of a cow or other ruminant, after the omasum; 

  • the lining of said compartment, considered as a foodstuff. 

mater

noun
  • A meninx; the dura mater, arachnoid mater, or pia mater of the brain. 

  • Mother. 

  • Someone or something that mates. 

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