According to Wiktionary, the British spelling of "vaporize" is vaporise, not vapourise as one might expect from the word vapour (and similarly, the Canadian spelling is still vaporize, not vapourize). The words "laborious" and "coloration" suffer from the same problem, and yet "favourable" doesn't. Why is this so?
And in case you think Wiktionary is a disputable source, the Cambridge Dictionary has no entry for vapourise either.
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