I stand somewhat corrected...
"A continent is one of Earth’s seven main divisions of land. The continents are, from largest to smallest: Asia, Africa, North America, South America, Antarctica, Europe, and Australia.
When geographers identify a continent, they usually include all the islands associated with it. Japan, for instance, is part of the continent of Asia. Greenland and all the islands in the Caribbean Sea are usually considered part of North America."
I'm not sure why this surprised me so much given it's proximity to Canada, but I'm not sure I've ever considered Greenland to be part of North America.