cowling vs fairing

cowling

noun
  • A removable protective covering for the engine of an aircraft, motorcycle, etc. 

  • A young or little cow; calf. 

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. 

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