axle

nouns

a shaft on which a wheel rotates
axle
is a part of
a vehicle that moves on wheels and usually has a container for transporting things or people
"the oldest known wheeled vehicles were found in Sumer and Syria and date from around 3500 BC"
wheeled vehicle
is a type of (narrower)
a long rod or pole (especially the handle of an implement or the body of a weapon like a spear or arrow)
shaft