The difference between Aroma and Odour
When used as nouns, aroma means a smell, whereas odour means any smell, whether fragrant or offensive.
check bellow for the other definitions of Aroma and Odour
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Aroma as a noun:
A smell; especially a pleasant spicy or fragrant one.
Examples:
"I love the aroma of [[cinnamon]]."
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Odour as a noun:
Any smell, whether fragrant or offensive; scent; perfume.
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Odour as a noun (now, _, rare):
Something which produces a scent; incense, a perfume.