appease vs perturb

appease

verb
  • To make quiet; to calm; to reduce to a state of peace; to dispel (anger or hatred). 

  • To come to terms with; to adapt to the demands of. 

perturb

verb
  • To disturb; to bother or unsettle. 

  • To modify the motion of a body by exerting a gravitational force. 

  • To modify slightly, such as an equation or value. 

  • To slightly modify the motion of an object. 

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