Chancellor vs first lieutenant

Chancellor

noun
  • An honorific for the head of state of a republic in Germany. 

first lieutenant

noun
  • An equivalent rank in other military forces. 

  • The second lowest rank of a commissioned officer in the United States Army, Air Force, or Marine Corps, ranking above a second lieutenant and below a captain. The rank of first lieutenant is equivalent to the naval rank of lieutenant junior grade. 

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