churning vs revolving

churning

noun
  • The act by which something is churned. 

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

revolving

noun
  • The act of something that revolves or turns. 

adj
  • moving around a central point. 

  • Relating to an account or line of credit where balances and credit roll over from one billing cycle to the next, such as a credit card. 

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