disturb vs embroil

disturb

verb
  • to have a negative emotional impact; to cause emotional distress or confusion. 

  • to divert, redirect, or alter by disturbing. 

  • to confuse a quiet, constant state or a calm, continuous flow, in particular: thoughts, actions or liquids. 

embroil

verb
  • To draw into a situation; to cause to be involved. 

  • To implicate in confusion; to complicate; to jumble. 

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