belt pulley
wheel
machine
simple machine
bollock
bullock block
fairlead
idle pulley
idle wheel
idler pulley
armature
axle
bearing
clamp
cog
crane
crank
cylinder
fitting
gear
hinge
hoist
hook
lever
pinion
piston
propeller
roller
scaffolding
screw
sheave
sling
sprocket
turbine
winch
windlass
Woolley
bully
fully
wooley
woolly
wooly