interpleader vs plaintiff

interpleader

noun
  • Motion for a third party to enter into a lawsuit in process because a matter is being adjudicated in which they have an interest. 

  • Process by which a third party asks a court to determine which of two rival claims is to be honored by the third party. 

  • One who makes an interplea. 

plaintiff

noun
  • A party bringing a suit in civil law against a defendant; accuser. 

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