mandible vs wishbone

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. 

wishbone

noun
  • A forked bone between the neck and breast of a bird consisting chiefly of the two clavicles fused at their median or lower end, regarded as a lucky charm in some countries. 

  • A suspension component similar in shape to a chicken wishbone. 

  • Any sailing vessel rigged with a wishbone. 

  • A particular kind of offensive formation. See wishbone formation. 

  • A spar in two parts, between which a sail is hoisted, the wishbone extending its clew. 

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