notary public vs process server

notary public

noun
  • An officer who can administer oaths and statutory declarations, witness and authenticate documents and perform certain other acts varying from jurisdiction to jurisdiction. 

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 notary public and process server occurred in a corpus of books? (source: Google Ngram Viewer )