contingency vs crisis

contingency

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

  • 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 statement which is neither a tautology nor a contradiction. 

crisis

noun
  • An unstable situation, in political, social, economic or military affairs, especially one involving an impending abrupt change. 

  • A crucial or decisive point or situation; a turning point. 

  • A traumatic or stressful change in a person's life. 

  • A sudden change in the course of a disease, usually at which point the patient is expected to either recover or die. 

  • A point in a drama at which a conflict reaches a peak before being resolved. 

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