Both spellings—"odor" and "odour"—are completely correct, but their usage is determined entirely by regional spelling conventions. "Odor" is the standard American English spelling utilized in the United States, whereas "odour" is the traditional British English spelling used throughout the United Kingdom, Canada, Australia, and other Commonwealth nations. Both words share the exact same Latin root, denote identical sensory definitions regarding scent and smell, and are universally understood across global English-speaking regions.
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