Balance beam and Rockers

Balance beam noun - A gymnastic apparatus used by women gymnasts.

Rockers and balance beam are semantically related. In some cases you can replace term "Rockers" with "Balance beam", this terms are similar.

Rockers noun - Originally a British youth subculture that evolved out of the teddy boys in the 1960s; wore black leather jackets and jeans and boots; had greased hair and rode motorcycles and listened to rock'n'roll; were largely unskilled manual laborers.

Balance beam and rockers are semantically related. Sometimes you can use "Balance beam" instead a noun "Rockers".