airfoil vs airplane

airfoil

noun
  • A wing of an aircraft. 

  • A structure shaped to produce lift when moving in air. 

airplane

noun
  • A powered heavier-than-air aircraft with fixed wings. 

verb
  • To transport by aeroplane. 

  • To fly in an aeroplane. 

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