erratic vs tranquil

erratic

noun
  • A rock moved from one location to another, usually by a glacier. 

  • Anything that has erratic characteristics. 

adj
  • Deviating from normal opinions or actions; eccentric; odd. 

  • Unsteady, random; prone to unexpected changes; not consistent. 

tranquil

adj
  • Calm; without motion or sound. 

  • Free from emotional or mental disturbance. 

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