Frontier vs Portal

Frontier

name
  • A city in North Dakota. 

  • An unincorporated community in Lincoln County, Wyoming. 

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

  • A village in Saskatchewan, Canada. 

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

Portal

name
  • A municipality of North Dakota. 

  • A surname. 

  • A town in Georgia, United States. 

  • A ghost town in California. 

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