roller

noun

a person or thing that rolls (in various senses)
any of various rolling cylinders or wheels; specif.,
1. a cylinder of metal, wood, etc. over which something is rolled for easier movement
2. a cylinder on which something is rolled up or wound: the roller of a shade, a hair roller
3. a heavy cylinder of metal, stone, etc. used to crush or smooth something
4. a cylinder covered with a napped fabric, fixed on a tool with a handle and used for applying paint
5. Printing a cylinder, usually of hard rubber, for spreading ink on the form just before the paper is impressed
a long bandage in a roll
a heavy, swelling wave that breaks on the shoreline
any of various birds that roll (in various senses); specif.,
1. any of a family (Coraciidae) of Old World, tropical coraciiform birds that roll and tumble in flight, as the (Coracias garrulus)
2. a canary that rolls, or trills, its notes