assurance vs security

assurance

noun
  • The state of being assured; total confidence or trust; a lack of doubt; certainty. 

  • Subjective certainty of one's salvation. 

  • The act of assuring; a declaration tending to inspire full confidence; something designed to give confidence. 

  • Firmness of mind; undoubting steadiness; intrepidity; courage; confidence; self-reliance. 

  • Insurance; a contract for the payment of a sum on occasion of a certain event, as loss or death. Assurance is used in relation to life contingencies, and insurance in relation to other contingencies. It is called temporary assurance, in the time within which the contingent event must happen is limited. 

  • Excessive boldness; impudence; audacity 

  • Any written or other legal evidence of the conveyance of property; a conveyance; a deed. 

security

noun
  • A guarantee. 

  • 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. 

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