agitation vs turbulence

agitation

noun
  • The act of agitating, or the state of being agitated; the state of being disrupted with violence, or with irregular action; commotion. 

  • A disturbance of personal tranquillity; disturbance of someone's peace of mind. 

  • Excitement of public feeling by discussion, appeals, etc. 

turbulence

noun
  • The state or fact of being turbulent or agitated; tempestuousness, disturbance. 

  • Disturbance in a gas or fluid, characterized by evidence of internal motion or unrest. 

  • Specifically, a state of agitation or disturbance in the air which is disruptive to an aircraft. 

  • An instance or type of such state or disturbance. 

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