flatland vs pasturage

flatland

noun
  • Synonym of plain: land of relatively constant altitude, usually exclusive of forests, deserts, and wastelands. 

  • An urban region with many flats or apartments to rent. 

pasturage

noun
  • A pasture; land that is used for pasture. 

  • The right to graze livestock on a pasture. 

  • The grass or other vegetation eaten by livestock and found in a pasture. 

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