accident vs surety

accident

noun
  • Any property, fact, or relation that is the result of chance or is nonessential or nonsubstantive. 

  • A person born from an unintended pregnancy. 

  • A collision or crash of a vehicle, aircraft, or other form of transportation that causes damage to the transportation involved; and sometimes injury or death to the transportation's occupants or bystanders in close proximity. (but see Usage notes) 

  • A property attached to a word, but not essential to it, such as gender, number, or case. 

  • An instance of incontinence. 

  • An unexpected event with negative consequences occurring without the intention of the one suffering the consequences, and (in the strict sense) not directly caused by humans. 

  • Chance; random chance. 

  • Urine or feces excreted due to incontinence. 

  • An irregular surface feature with no apparent cause. 

  • A sudden discontinuity of ground such as fault of great thickness, bed or lentil of unstable ground. 

  • A point or mark which may be retained or omitted in a coat of arms. 

  • An unintended pregnancy. 

  • Any chance event. 

  • casus; such unforeseen, extraordinary, extraneous interference as is out of the range of ordinary calculation. 

adj
  • Designating any form of transportation involved in an accident. 

surety

noun
  • A promise to pay a sum of money in the event that another person fails to fulfill an obligation. 

  • One who undertakes to pay money or perform other acts in the event that his principal fails therein. 

  • A substitute; a hostage. 

  • Evidence; confirmation; warrant. 

  • Certainty. 

  • That which makes sure; that which confirms; ground of confidence or security. 

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