shop steward vs warden

shop steward

noun
  • A local member of a trade union elected to represent his fellow workers in discussions with the management at a workplace. 

warden

noun
  • A governing official in various institutions 

  • An official charged with supervisory duties or with the enforcement of specific laws or regulations; such as a game warden or air-raid warden 

  • A variety of pear. 

  • A chief administrative officer of a prison. 

verb
  • To carry out the duties of a warden. 

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