committee vs workgroup

committee

noun
  • A body of one or more persons convened for the accomplishment of some specific purpose, typically with formal protocols. 

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 committee and workgroup occurred in a corpus of books? (source: Google Ngram Viewer )