roller -
a small wheel without spokes (as on a roller skate)
wheel a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)
roller skate a shoe with pairs of rollers fixed to the sole
roller -
pigeon that executes backward somersaults in flight or on the ground
moving ridge,
wave a movement like that of a sudden occurrence or increase in a specified phenomenon; "a wave of settlers"; "troops advancing in waves"
roller -
a grounder that rolls along the infield
roller -
a mechanical device consisting of a cylindrical tube around which the hair is wound to curl it; "a woman with her head full of curlers is not a pretty sight"
roller -
A padded surcingle that is used on horses for training and vaulting.
roller -
A roll of titles or especially credits played over film or video; television or film credits.
roller -
One of a set of small cylindrical tubes used to curl hair.
Wikipedia
The rollers are an Old World family, Coraciidae, of near passerine birds . The group gets its name from the aerial acrobatics some of these birds perform during courtship or territorial flights. Rollers resemble crows in size and build, and share the colourful appearance of kingfishers and bee-eaters, blues and pinkish or cinnamon browns predominating.