affair vs enterprise

affair

noun
  • Something which is done or is to be done; business of any kind, commercial, professional, or public. 

  • An action or engagement not of sufficient magnitude to be called a battle. 

  • An adulterous relationship (from affaire de cœur, affair of the heart). 

  • A person with whom someone has an adulterous relationship. 

  • A romantic relationship with someone who is not one's regular partner (boyfriend, girlfriend). 

  • A party or social gathering, especially of a formal nature. 

  • Any proceeding or action which it is wished to refer to or characterize vaguely. 

  • A material object (vaguely designated). 

enterprise

noun
  • A company, business, organization, or other purposeful endeavor. 

  • Active participation in projects. 

  • A willingness to undertake new or risky projects; energy and initiative. 

  • An undertaking, venture, or project, especially a daring and courageous one. 

verb
  • To treat with hospitality; to entertain. 

  • To undertake; to begin and attempt to perform; to venture upon. 

  • To undertake an enterprise, or something hazardous or difficult. 

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