confidence vs know

confidence

noun
  • Information held in secret; a piece of information shared but to thence be kept in secret. 

  • A feeling of certainty; firm trust or belief; faith. 

  • Self-assurance. 

know

noun
  • Knowledge; the state of knowing; now confined to the fixed phrase ‘in the know’ 

  • Knowledge; the state of knowing. 

verb
  • To perceive the truth or factuality of; to be certain of or that. 

  • To experience. 

  • To understand or have a grasp of through experience or study. 

  • To be or become aware or cognizant. 

  • To be able to play or perform (a song or other piece of music). 

  • To be acquainted or familiar with; to have encountered. 

  • To be aware of; to be cognizant of. 

  • To recognize as the same (as someone or something previously encountered) after an absence or change. 

  • To have knowledge; to have information, be informed. 

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