counselor vs process server

counselor

noun
  • An attorney. 

  • A children’s supervisor, usually at camp. 

  • A school counselor, often in a specialty such as careers, education, or health. 

  • A professional who counsels people, especially on personal problems. 

  • A high ranking diplomat, usually just below an ambassador or minister. 

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