safety vs security

safety

noun
  • The condition or feeling of being safe; security; certainty. 

  • An instance of a player being sacked or tackled in the end zone, or stepping out of the end zone and off the field, resulting in two points to the opposite team. 

  • A mechanism on a weapon or dangerous equipment designed to prevent accidental firing. 

  • Any of the defensive players who are in position furthest from the line of scrimmage and whose responsibility is to defend against passes as well as to be the tacklers of last resort. 

  • A safety squeeze. 

  • Preservation from escape; close custody. 

verb
  • to secure a firing pin, as in guns, to keep the gun from firing 

  • To secure (a mechanical component, as in aviation) to keep it from becoming detached even under vibration. 

security

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

  • 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. 

  • 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 safety and security occurred in a corpus of books? (source: Google Ngram Viewer )