Horizontal bar and Rails

Horizontal bar noun - Gymnastic apparatus consisting of a bar supported in a horizontal position by uprights at both ends.

Rails and horizontal bar are semantically related. In some cases you can replace term "Rails" with "Horizontal bar", this terms are similar.

Rails noun - A bar or pair of parallel bars of rolled steel making the railway along which railroad cars or other vehicles can roll.

Horizontal bar and rails are semantically related. Sometimes you can use "Horizontal bar" instead a noun "Rails".