Fertile vs Sterling

Fertile

name
  • A city and town in Minnesota. 

  • A city and town in Iowa. 

Sterling

name
  • A city in Rice County, Kansas, United States. 

  • An English surname, thought to be a variant of Starling. 

  • A unisex given name transferred from the surname. 

  • A Scottish surname, variant of Stirling. 

  • A census-designated place in Loudoun County, Virginia, United States. 

  • A city, the county seat of Logan County, Colorado, United States. 

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