institute vs special interest

institute

noun
  • An organization founded to promote a cause 

  • The person to whom an estate is first given by destination or limitation. 

  • An institution of learning; a college, especially for technical subjects 

  • The building housing such an institution 

verb
  • To invest with the spiritual charge of a benefice, or the care of souls. 

  • To nominate; to appoint. 

  • To begin or initiate (something); to found. 

special interest

noun
  • A particular political issue that is the focus of political advocacy. 

  • A topic of particular interest and passion, particularly for an autistic person. 

  • A shadowy group with political power. 

  • Used other than figuratively or idiomatically: see special, interest. 

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