Mainland vs Till

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. 

Till

name
  • A river in Lincolnshire, England, United Kingdom 

  • A river in Northumberland, England, United Kingdom, tributary to the Tweed. 

  • A river in Wiltshire, England, United Kingdom 

  • A surname. 

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