false friend vs stranger

false friend

noun
  • Used other than figuratively or idiomatically: see false, friend. 

  • A word in a language that bears a deceptive resemblance to a word in another language but in fact has a different meaning. 

stranger

noun
  • A person whom one does not know; a person who is neither a friend nor an acquaintance. 

  • One who has not been seen for a long time. 

  • A newcomer. 

  • An outsider or foreigner. 

  • One not admitted to communion or fellowship. 

  • One not privy or party to an act, contract, or title; a mere intruder or intermeddler; one who interferes without right. 

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