flatland vs llano

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. 

llano

noun
  • A plain or steppe in parts of Latin America. 

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