The difference between Roof and Rooftop
When used as nouns, roof means the external covering at the top of a building, whereas rooftop means the area atop a roof.
Roof is also verb with the meaning: to cover or furnish with a roof.
Rooftop is also adjective with the meaning: atop a roof.
check bellow for the other definitions of Roof and Rooftop
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Roof as a noun:
The external covering at the top of a building
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Roof as a noun:
The upper part of a cavity.
Examples:
"The palate is the roof of the mouth."
"Archaeologists discovered that the cave's roof was decked with paintings."
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Roof as a noun (mining):
The surface or bed of rock immediately overlying a bed of coal or a flat vein.
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Roof as a verb:
To cover or furnish with a roof.
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Roof as a verb:
To traverse buildings by walking or climbing across their roofs.
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Roof as a verb (slang):
To put into prison for not a short time.
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Rooftop as a noun (somewhat formal):
The area atop a roof.
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Rooftop as a noun:
The top layer of a roof; the material covering or composing a roof.
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Rooftop as an adjective:
Atop a roof; on a roof.