given the seo advantage, I registered the CanadianWord1Word2.ca domain.
I believe this could be better than word1word2.ca because the search on this item comes mostly from outside of Canada. So they have to use the “Canadian” prefix in order to get that version of the information they are searching for.
Register a .net if you’re looking to target Canada and North America as well as any other international audience. If you’re looking for just Canadian traffic, then .ca would work too, but being there are French Canadians I would root for the .net - I know a site that sells them for $6.49/yr. I’ve been getting .net domains recently.