A circular object that revolves on an axle and is used for transportation or movement.

पहिया

English Usage: The cart moved smoothly on its wheels.

Hindi Usage: गाड़ी अपने पहियों पर धीरे-धीरे बढ़ी।

Means "on or in a state of being on wheels."

पहिये पर

English Usage: The car was awheel after the repair.

Hindi Usage: मरम्मत के बाद कार पहिये पर थी।