rocker - noun

an attendant who rocks a child in a cradle

a performer or composer or fan of rock music

a teenager or young adult in the 1960s who wore leather jackets and rode motorcycles

a chair mounted on rockers

a trough that can be rocked back and forth; used by gold miners to shake auriferous earth in water in order to separate the gold

an ice skate with a curved blade

a curved support that permits the supported object to rock to and fro

rocker - thesaurus

cradle