disguise vs dissimulate

disguise

verb
  • To avoid giving away or revealing (something secret); to hide by a false appearance. 

  • To change the appearance of (a person or thing) so as to hide, or to assume an identity. 

noun
  • The act or state of disguising, notably as a ploy. 

  • The appearance of something on the outside which masks what’s beneath. 

  • Material (such as clothing, makeup, a wig) used to alter one’s visual appearance in order to hide one's identity or assume another. 

dissimulate

verb
  • To disguise or hide by adopting a false appearance. 

  • To connive at; to wink at; to pretend not to notice. 

  • To practise deception by concealment or omission, or by feigning a false appearance. 

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