roll - verb (used without object)
1. to move along a surface by revolving or turning over and over, as a ball or a wheel.
2. to move or be moved on wheels, as a vehicle or its occupants.
3. to flow or advance in a stream or with an undulating motion, as water, waves, or smoke.
role - noun
1. a part or character played by an actor or actress.
2. proper or customary function: the forward's role in the team.
3. Sociology . the rights, obligations, and expected behaviour patterns associated with a particular social status.