eye-opener vs secret

eye-opener

noun
  • A startling or shocking revelation. 

  • A strong alcoholic beverage, especially one consumed in the morning. 

  • Something that causes the eyes to open, or that opens the eyes. 

  • An attractive woman. 

  • Something that provides a sudden insight, or makes something clear that was previously mysterious. 

secret

noun
  • Something not understood or known. 

  • Private seclusion. 

  • A piece of knowledge that is hidden and intended to be kept hidden. 

  • The key or principle by which something is made clear; the knack. 

  • A form of steel skullcap. 

  • Any prayer spoken inaudibly and not aloud; especially, one of the prayers in the Tridentine Mass, immediately following the "orate, fratres", said inaudibly by the celebrant. 

adj
  • Being or kept hidden. 

verb
  • To make or keep secret. 

  • To hide secretly. 

How often have the words eye-opener and secret occurred in a corpus of books? (source: Google Ngram Viewer )