professional vs vocative

professional

noun
  • A person who belongs to a profession 

  • A reputation known by name 

  • A prostitute 

  • An expert 

  • One of four categories of sociologist propounded by Horowitz: a sociologist who is actively concerned with promoting the profession of sociology. 

  • A person who earns their living from a specified activity 

adj
  • Expert. 

  • Of, pertaining to, or in accordance with the (usually high) standards of a profession. 

  • That is carried out for money, especially as a livelihood. 

vocative

noun
  • The vocative case 

  • A word in the vocative case 

  • Something said to (or as though to) a particular person or thing; an entreaty, an invocation. 

adj
  • Of or pertaining to calling; used in calling or vocation. 

  • Used in address; appellative (said of that case or form of the noun, pronoun, or adjective, in which a person or thing is addressed). For example "Domine, O Lord" 

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