pitched vs pitching

pitched

adj
  • Fought at a particular place and time, at which opposing forces anticipate and commit to fighting; (later especially) involving sustained, intense military (or by extension, political, legal etc.) fighting. 

  • Having a slope. 

  • Covered in pitch. 

  • Having a specified tonal range. 

pitching

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

  • The act of throwing or casting. 

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

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