Swing, Rocker
A swing is a seat hanging by two ropes or chains from a metal frame or from the branch of a tree. You can sit on the seat and move forwards and backwards through the air.
A rocking chair or rocker is a type of chair with two curved bands (also known as rockers) attached to the bottom of the legs, connecting the legs on each side to each other. The rockers contact the floor at only two points, giving the occupant the ability to rock back and forth by shifting their weight or pushing lightly with their feet. Rocking chairs are most commonly made of wood. Some rocking chairs can fold.