pitfall vs security

pitfall

noun
  • A potential, unsuspected, hidden problem, hazard, or danger that is easily encountered but not immediately obvious. 

  • A type of trap consisting of a concealed pit in the ground, which the victim is supposed to fall into and not be able to get out from. 

  • An antipattern. 

  • Subsidence below ground in a mine, which can cause the ground level above to drop. 

security

noun
  • Proof of ownership of stocks, bonds or other investment instruments. 

  • Property etc. temporarily relinquished to guarantee repayment of a loan. 

  • Something that secures the fulfillment of an obligation or law. 

  • A guarantee. 

  • The condition of not being threatened, especially physically, psychologically, emotionally, or financially. 

  • Something that secures. 

  • An organization or department responsible for providing security by enforcing laws, rules, and regulations as well as maintaining order. 

  • Freedom from apprehension. 

  • A tradeable financial asset, such as a share of stock.ᵂ 

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