conduction vs pilotage

conduction

noun
  • The act of leading or guiding. 

  • The conveying of heat or electricity through material. 

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 conduction and pilotage occurred in a corpus of books? (source: Google Ngram Viewer )