fairing vs wheel arch

fairing

noun
  • A structure on various parts of a vehicle, for example an aircraft, automobile, or motorcycle, that produces a smooth exterior and reduces drag. 

  • A type of small gingerbread biscuit; a ginger nut. 

wheel arch

noun
  • The shaped part of the bodywork of a car or other vehicle that allows the wheel to be accessed, and in the case of front wheels, enable them to be steered. 

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