noun (n)

• the particular occupation for which you are trained(noun.act)

  Synonym:
  calling, career
  

  source: wordnet30
• a body of people doing the same kind of work(noun.group)

  Synonym:
  occupational group
  

  source: wordnet30
• A call; a summons; a citation; especially, a designation or appointment to a particular state, business, or profession.(noun)

  source: webster1913