pitching vs rocking

pitching

noun
  • A facing of stone laid upon a bank to prevent wear by tides or currents. 

  • The rough paving of a street to a grade with blocks of stone. 

  • The act of throwing or casting. 

rocking

noun
  • The motion of something that rocks. 

  • The abrading of a copper plate with a rocker, preparatory to mezzotinting. 

  • The motion by which the design on a steel mill is transferred to a copper cylinder. 

adj
  • Excellent; great. 

  • Shaking, swaying or moving back and forth. 

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