The difference between Roughness and Smoothness
When used as nouns, roughness means the property of being rough, coarseness, whereas smoothness means the condition of being smooth.
check bellow for the other definitions of Roughness and Smoothness
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Roughness as a noun:
The property of being rough, coarseness.
Examples:
"The roughness of the road made me wonder if my car would fall apart."
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Smoothness as a noun:
The condition of being smooth.