contingency vs plan

contingency

noun
  • An amount of money which a party to a contract has to pay to the other party (usually the supplier of a major project to the client) if he or she does not fulfill the contract according to the specification. 

  • The quality of being contingent, of happening by chance. 

  • A possibility; something which may or may not happen. A chance occurrence, especially in finance, unexpected expenses. 

  • A statement which is neither a tautology nor a contradiction. 

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. 

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