Frontier vs Mainland

Frontier

name
  • A village in Saskatchewan, Canada. 

  • An unincorporated community in Lincoln County, Wyoming. 

  • An unincorporated community in Koochiching County, Minnesota, United States, located on the Canadian border. 

  • A city in North Dakota. 

  • The Rural Municipality of Frontier No. 19, a rural municipality on the US border in south-west Saskatchewan, which includes the village. 

Mainland

name
  • A historical region in British Columbia, British North America, British Empire 

  • The largest island in the Orkney Islands council area, to the north of Scotland. 

  • The largest island in the Shetland Islands council area, to the north of both Orkney and Scotland. 

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