plan vs windfall

plan

verb
  • To create a plan for. 

  • To intend. 

  • To design (a building, machine, etc.). 

  • To make a plan. 

noun
  • A drawing showing technical details of a building, machine, etc., with unwanted details omitted, and often using symbols rather than detailed drawing to represent doors, valves, etc. 

  • A subscription to a service. 

  • A set of intended actions, usually mutually related, through which one expects to achieve a goal. 

  • A method; a way of procedure; a custom. 

  • A two-dimensional drawing of a building as seen from above with obscuring or irrelevant details such as roof removed, or of a floor of a building, revealing the internal layout; as distinct from the elevation. 

windfall

noun
  • Something that has been blown down by the wind. 

  • A fruit that has fallen from a tree naturally, as from wind. 

  • A sudden large benefit; especially, a sudden or unexpected large amount of money, as from lottery or sweepstakes winnings or an unexpected inheritance or gift. 

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