moratorium vs prorogation

moratorium

noun
  • A suspension of an ongoing activity. 

  • An authorization to a debtor, permitting temporary suspension of payments. 

prorogation

noun
  • Causing something to last longer or remain in effect longer; prolongation, continuance. 

  • The period of such a discontinuance between two sessions of a legislative body. 

  • The action of proroguing an assembly, especially a parliament; discontinuance of meetings for a given period of time, without dissolution. 

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