churning vs thrusting

churning

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

  • The act by which something is churned. 

thrusting

noun
  • The white whey, or that which is last pressed out of the curd by the hand, and of which butter is sometimes made. 

  • The act of squeezing curd by hand, to expel the whey. 

  • The motion by which someone or something thrusts. 

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