rocker >> ˈrɒkə
Definition: [noun] a person who performs, dances to, or enjoys rock music.
Example: a punk rocker
Definition: [noun] a rocking device forming part of a mechanism, especially one for controlling the positions of brushes in a dynamo.
Definition: [noun] a curved bar or similar support on which something such as a chair or cradle can rock.
Definition: [noun] the amount of curvature in the longitudinal contour of a boat or surfboard.
Example: the hull lines are classic with considerable rocker