noun
A thin, circular body that turns on an axis
disk, ratchet, ring, hoop, roller, roulette, caster, drum, ferris wheel, wheel trolley, flywheel, cogwheel, steering wheel, sprocket, wheel, chain wheel, water wheel, noria, sakieh.
A two-wheeled vehicle
bicycle, velocipede, tandem, bike*.
Machinery; often used figuratively
motive power, dynamo, engine, apparatus, motor, engine, controlling force, instrumentality.
*An important person
personage, big wheel*, big shot*, V.I.P.*; see celebrity 2.
at the wheel