chap vs molar

chap

noun
  • One of the jaws or cheeks of a vice, etc. 

  • A cleft, crack, or chink, as in the surface of the earth, or in the skin. 

  • A man, a fellow. 

  • A customer, a buyer. 

  • A blow; a rap. 

  • A child. 

verb
  • To cause to open in slits or chinks; to split; to cause the skin of to crack or become rough. 

  • Of the skin, to split or flake due to cold weather or dryness. 

  • To strike, knock. 

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 chap and molar occurred in a corpus of books? (source: Google Ngram Viewer )