mandible vs pecker

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. 

pecker

noun
  • A bird's beak or bill. 

  • Someone who or something that pecks, striking or piercing in the manner of a bird's beak or bill 

  • Any machine or machine part moving in a pecking fashion 

  • A kind of V-shaped telegraphic relay. 

  • A bird, particularly a member of the group including the woodpeckers, flowerpeckers, oxpeckers, and berrypeckers. 

  • Any tool used in a pecking fashion, particularly kinds of hoes or pickaxes. 

  • A penis; cock, dick. 

  • Spirits, nerve, courage. 

  • A nose. 

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