materialist vs middle class

materialist

noun
  • Someone who is materialistic, concerned only with material possessions. 

  • A follower or proponent of philosophical materialism. 

adj
  • Having features typical of philosophical materialism. 

middle class

noun
  • A social and economic class lying above the working class and below the upper class. 

  • The groups in society composed of professionals, semi-professionals, and lower to middle managerial level workers. 

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