groundwork vs planning

groundwork

noun
  • The foundation; the basic or fundamental parts that support or allow for the rest. 

planning

noun
  • The act of making contingency plans. 

  • Action of the verb to plan. 

  • Planning permission. 

  • The act of formulating of a course of action, or of drawing up plans. 

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