airfoil vs control surface

airfoil

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

  • A wing of an aircraft. 

control surface

noun
  • A moveable surface attached to a machine such as an aircraft or submarine that can be used to control the machine's motion in roll, pitch or yaw. 

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