fraternity vs workgroup

fraternity

noun
  • A group of people associated for a common purpose. 

  • A social organization of male students at a college or university; usually identified by Greek letters. 

  • The quality of being brothers or brotherly; brotherhood. 

workgroup

noun
  • A group of workers engaged in a series of collaborative tasks who usually work together. 

  • A computer network created for use by such groups. 

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