judicial officer vs process server

judicial officer

noun
  • A huissier de justice, a process server and officer of the court in several European countries. 

  • A public officer authorized to hear and decide cases in a court of law. 

process server

noun
  • A deliverer of processes or summonses, the formal announcements of the beginning of a legal action; a huissier de justice or other equivalent position in other legal systems. 

How often have the words judicial officer and process server occurred in a corpus of books? (source: Google Ngram Viewer )