aileron vs paraglider

aileron

noun
  • The hinged part on the trailing edge of an airplane wing, used to control longitudinal turns. 

  • A half gable, as at the end of a penthouse or of the aisle of a church. 

paraglider

noun
  • The wing used for paragliding, which can be separated from the harness. 

  • One who paraglides. 

  • The complete equipment used for paragliding, consisting of a paraglider wing and a harness. 

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