betray vs make known

betray

verb
  • To violate the confidence of, by disclosing a secret, or that which one is bound in honor not to make known. 

  • To prove faithless or treacherous to, as to a trust or one who trusts; to be false to; to deceive. 

  • To deliver into the hands of an enemy by treachery or fraud, in violation of trust; to give up treacherously or faithlessly. 

  • To disclose or indicate, for example something which prudence would conceal; to reveal unintentionally. 

  • To mislead; to expose to inconvenience not foreseen; to lead into error or sin. 

  • To lead astray; to seduce (as under promise of marriage) and then abandon. 

make known

verb
  • To disclose (a secret). 

  • To announce (some information) generally. 

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