disquiet vs disturb

disquiet

verb
  • To make (someone or something) worried or anxious. 

noun
  • Lack of quiet; absence of tranquility in body or mind 

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. 

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