confidential vs intimate

confidential

adj
  • Kept, or meant to be kept, secret within a certain circle of persons; not intended to be known publicly 

intimate

adj
  • Personal; private. 

  • Pertaining to details that require great familiarity to know. 

  • Closely acquainted; familiar. 

  • Very finely mixed. 

  • Of or involved in a sexual relationship. 

verb
  • To suggest or disclose (something) discreetly. 

  • To notify. 

noun
  • A very close friend. 

  • Women's underwear, sleepwear, or lingerie, especially offered for sale in a store. 

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