coronet vs first lieutenant

coronet

noun
  • The traditional lowest regular commissioned officer rank in the cavalry. 

  • A small crown, such as is worn by a noble. 

  • The ring of tissue between a horse's hoof and its leg. 

  • Any of several hummingbirds in the genus Boissonneaua. 

  • A species of moth, Craniophora ligustri. 

first lieutenant

noun
  • 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. 

  • An equivalent rank in other military forces. 

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