The difference between Aroma and Odor
When used as nouns, aroma means a smell, whereas odor means any smell, whether fragrant or offensive.
check bellow for the other definitions of Aroma and Odor
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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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Odor as a noun:
Any smell, whether fragrant or offensive; scent; perfume.
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Odor as a noun (figuratively):
A strong, pervasive quality.
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Odor as a noun (figuratively, uncountable):
Esteem; repute.