room and board vs subsistence

room and board

noun
  • A place of lodging with daily meals, usually provided in return for rent or other considerations. 

subsistence

noun
  • Something (food, water, money, etc.) that is required to stay alive. 

  • Embodiment or personification or hypostasis of an underlying principle or quality. 

  • Real being; existence. 

  • Inherency. 

  • The act of maintaining oneself at a minimum level. 

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