speedboarding

As nouns the difference between speedboarding and speedboarder

is that speedboarding is an extreme sport which involves racing on a streamline skateboard down steep hills, often on public roads while speedboarder is a person who practices the extreme sport of speedboarding.

As nouns the difference between skateboard and speedboarding

is that skateboard is skateboard (platform on wheels) while speedboarding is an extreme sport which involves racing on a streamline skateboard down steep hills, often on public roads.

As nouns the difference between streamline and speedboarding

is that streamline is (physics) a line that is tangent to the velocity of flow of a fluid; equivalent to the path of a specific particle in that flow while speedboarding is an extreme sport which involves racing on a streamline skateboard down steep hills, often on public roads.

As a verb streamline

is to design and construct the contours of a vehicle etc so as to offer the least resistance to its flow through a fluid.