Island vs Mainland

Island

name

  • Vancouver Island 

  • HM Prison Parkhurst, a prison on the Isle of Wight. 

  • Long Island (in New York State) 

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 Island and Mainland occurred in a corpus of books? (source: Google Ngram Viewer )