churning vs turbulent

churning

noun
  • The quantity of butter prepared (by churning) at one time. 

  • The act by which something is churned. 

turbulent

adj
  • violently disturbed or agitated; tempestuous, tumultuous 

  • being in, or causing, disturbance or unrest 

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