confidante vs informer

confidante

noun
  • A female confidant. 

  • A type of settee having a seat at each end at right angles to the main seats. 

informer

noun
  • One who informs, animates, or inspires. 

  • A person who tells authorities about improper or illegal activity. 

  • One who informs someone else about something. 

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