The difference between Belle and Belles-lettres
When used as nouns, belle means an attractive woman, whereas belles-lettres means the humanities.
check bellow for the other definitions of Belle and Belles-lettres
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Belle as a noun:
An attractive woman.
Examples:
"In her new dress she felt like the belle of the ball."
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Belles-lettres as a noun (obsolete):
The humanities.
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Belles-lettres as a noun (archaic):
Literature, particularly light compositions valued for their aesthetic properties.
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Belles-lettres as a noun (archaic):
Literary studies, particularly literary aesthetics.