false friend vs traditor

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. 

traditor

noun
  • A deliverer; a name of infamy given to Christians who delivered the Scriptures, or the goods of the church, to their persecutors to save their lives. 

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