They're both words, but one is used primarily in one country and one is used in another.Madara said:I don't know, that's a good question. I think I use both, it will just come out as I'm saying it. Not too sure which one is the correct way though, unless they're both correct.
I'm glad you still voted Spelt, I would of had to kill you if you didn't.Random said:I'd rather say "you spell this word incorrect when you attempt to spell it: <insert word>." which is also correct.