fluster vs turbulence

fluster

noun
  • A state of being flustered; overwrought confusion. 

verb
  • To confuse; befuddle; throw into panic by making overwrought with confusion. 

  • To be in a heat or bustle; to be agitated and confused. 

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 fluster and turbulence occurred in a corpus of books? (source: Google Ngram Viewer )