assured vs promissory

assured

adj
  • Guaranteed; secure. 

  • Self-confident; self-assured; sure. 

noun
  • An insured person. 

promissory

adj
  • Containing or consisting of a promise. 

  • Stipulating the future actions required of the parties to an insurance policy or other business agreement. 

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