Rain Gutter- also known as a "rain catcher", is a narrow channel, or trough, forming the component of a roof system which collects and diverts rainwater away from the roof edge.
Downpipe- water collected by a rain gutter is fed from the roof edge to the base of the building where it is either discharged or collected
Gutter guard- is any piece that attaches to the gutter and prevents unwanted materials from entering. Usually, those unwanted materials are leaves, branches, and other outdoor debris
Debris- scattered fragments, typically of something wrecked or destroyed; dirt or refuse