Reply to comment about "Why Canadian spelling is different"

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Submitted by Terrence on May 28, 2021, at 15:54

Living in America(U.S.), I get mostly frustrated playing the word game 'Scrabble'.
My English must be extremely difficult to learn for foreigners! Even we get confused.
My question is: What's the correct way to spell...
Canadian OR Canadien?
Does the latter only apply to people or in a possessive term?
Confusing!!!