lower jaw vs molar

lower jaw

noun
  • The part of the face below the mouth; the jaw. 

  • Specifically, the bone therein; the mandible of humans and other vertebrates that, with the cranium, composes the skull. 

molar

noun
  • A back tooth having a broad surface used for grinding one's food. 

  • A unit of concentration equal to one mole per litre. 

adj
  • Of, relating to, or being a solution containing one mole of solute per litre of solution. 

  • Of or relating to a complete body of matter as distinct from its molecular or atomic constituents. 

  • Of or relating to the molar teeth, or to grinding. 

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