rocker

keinutuoli

rockmuusikko

rokkari

keinuttaja

jalas A curved piece of wood attached to the bottom of a rocking chair or cradle that enables it to rock back and forth.
A rocking chair.
puhekieltä The lengthwise curvature of a surfboard. (More rocker is a more curved board.)

All modern surfboards share a similar rocker design — Bruce Jones http://www.brucejones.com/longboar.htm

"Girls & Boys" is (..) also a tart, sneering rocker, full of ingenious musical gestures (..)

It was I, sir, said the rocker, who had the honour, some thirty years since, to attend on your highness in your infancy.