conductivity vs leadership

conductivity

noun
  • The reciprocal of resistivity 

  • The ability of a material to conduct electricity, heat, fluid or sound 

leadership

noun
  • The capacity of someone to lead others. 

  • A group of leaders. 

  • The office or status of a leader. 

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