mandible vs neb

mandible

noun
  • Either of the upper and lower segments of a bird's beak. 

  • Any of various invertebrate mouthparts serving to hold or bite food materials. 

  • One of the anterior pair of mouthparts of an arthropod, designed for holding and cutting food. 

  • The jaw or a jawbone, especially the lower jawbone in mammals and fishes. 

neb

noun
  • A bird's beak or bill. 

  • A nib, as of a pen. 

  • A person's nose. 

  • The peak of a flat cap. 

  • The nose or snout of an animal, now especially of a fish. 

  • A projecting extremity; a point or sharp projection. 

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