A surveyor's wheel, also called a clickwheel, hodometer, waywiser, trundle wheel, measuring wheel, or perambulator is a device for measuring distance.
I think its called a trogan wheel or something...
The center of a wheel is generally called a hub.
The very outside part of a black hole when "feeding" is called the Accretion Disc. when a black hole is not devouring a star the outside part becomes the Event Horizon.
Lava
rim
rim
The outside of a wheel is the rim.
The circle in the wheel is called the rims
a Rim
rim
It's called a Mag wheel.
A tooth on a wheel gear is called a cog.
The steering wheel of a ship or boat is called the wheel, sometimes the trick wheel on ships with multiple steering systems. The propeller of the boat or ship is sometimes also called the wheel or screw.
A steering wheel on a sail boat is still called a steering wheel.
a groovy wheel.
what is a hub of a wheel called beginning with the letter n