paraglider vs roofing

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. 

roofing

noun
  • Material used on the outside of a roof, such as shingles. 

  • The process of constructing a roof or roofs. 

  • A way of travel which consists in clambering over the roofs of skyscrapers. 

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