make known vs unmask

make known

verb
  • To disclose (a secret). 

  • To announce (some information) generally. 

unmask

verb
  • To expose, or reveal the true character of someone. 

  • To cease engaging in masking, to cease disguising one's autism. 

  • To enable (an interrupt, etc.) by unsetting or setting the associated bit. 

  • To remove a mask from someone. 

  • To remove one's mask. 

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