assumpsit vs lawsuit

assumpsit

noun
  • An action to recover damages for breach or nonperformance of such a promise. 

  • A promise or undertaking, either express or implied, founded on a consideration. 

lawsuit

noun
  • In civil law, a case where two or more people disagree and one or more of the parties take the case to a court for resolution. 

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