assiduity vs continuance

assiduity

noun
  • Great and persistent toil or effort. 

  • Constant personal attention, solicitous care. 

continuance

noun
  • The action of continuing. 

  • An order issued by a court granting a postponement of a legal proceeding for a set period. 

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