guiding vs pilotage

guiding

noun
  • Guidance. 

  • Girl Guiding. 

pilotage

noun
  • The occupation of a pilot. 

  • The use of landmarks to guide a vessel or aircraft to its destination. 

  • The fee paid to a pilot. 

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