lawsuit vs procedural law

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. 

procedural law

noun
  • The law that comprises the rule by which a court hears and determines what happens in civil or criminal proceedings. 

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