mandible vs nib

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. 

nib

noun
  • The bill or beak of a bird; the neb. 

  • A small and pointed thing or part; a point; a prong. 

  • The shaft of a wagon. 

  • A piece of a roasted, hulled cocoa bean. 

  • Bits of trapped dust or other foreign material that form imperfections in painted or varnished surfaces. 

  • One of the handles projecting from a scythe snath. 

  • The tip of a pen or tool that touches the surface, transferring ink to paper. 

verb
  • To fit (a pen) with a nib. 

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