ambiance vs milieu

ambiance

noun
  • A particular mood or atmosphere of an environment or surrounding influence. 

  • A secondary color of a polygon that becomes more pronounced with shading. 

milieu

noun
  • A social environment or setting. 

  • A group of people with a common point of view; a social class or group. 

  • An environment or setting; a medium. 

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