peace vs perturbation

peace

verb
  • To make peace; to put at peace; to be at peace. 

  • To peace out. 

intj
  • Peace out; goodbye. 

noun
  • A state of tranquility, quiet, and harmony; absence of violence. For instance, a state free from civil disturbance. 

  • A state free of war, in particular war between different countries. 

  • A state free of oppressive and unpleasant thoughts and emotions. 

  • Harmony in personal relations. 

perturbation

noun
  • Variation in an orbit due to the influence of external bodies 

  • Agitation; the state of being perturbed 

  • A small change in a physical system, or more broadly any definable system (such as a biological or economic system) 

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