Odour vs. Odor: What's the Difference?

Odour and Odor Definitions
Odour
Variant of odor.
Odor
A quality of something that is perceived by the sense of smell
Kitchen odors.
Odour
(British spelling) odor
Odor
A strong, pervasive quality
An odor of sadness permeated the gathering.
Odour
The sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form;
She loved the smell of roses
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Odor
Esteem; repute
A doctrine that is not currently in good odor.
Odour
Any property detected by the olfactory system
Odor
Any smell, whether fragrant or offensive.
Odor
(figuratively) A strong, pervasive quality.
Odor
Esteem.
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Odor
Something which produces a scent; incense, a perfume.
Odor
Any smell, whether fragrant or offensive; scent; perfume.
Meseemed I smelt a garden of sweet flowers,That dainty odors from them threw around.
Odor
Any property detected by the olfactory system
Odor
The sensation that results when olfactory receptors in the nose are stimulated by particular chemicals in gaseous form;
She loved the smell of roses