pilothouse vs wheel arch

pilothouse

noun
  • A wheelhouse. 

  • A yacht or other small vessel which has a wheelhouse. 

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 pilothouse and wheel arch occurred in a corpus of books? (source: Google Ngram Viewer )