| oscillating(noun, unstable, unsteady, vibrate) |
| oscillating motion(noun, swing, waver, sea) |
| oscillatory motion(noun, swing, waver, sea) |
| pendulum(noun, thing, equipment, apparatus) |
| pendulum apparatus(noun, thing, equipment, apparatus) |
| pitching(noun, swing, waver, sea) |
| poise(noun, unstable, unsteady, vibrate) |
| qualms(noun, unstable, unsteady, vibrate) |
| reel(noun, unstable, unsteady, vibrate) |
| reel off(noun, unstable, unsteady, vibrate) |
| reeler(noun, unstable, unsteady, vibrate) |
| rock(noun, unstable, unsteady, vibrate) |
| rocker(noun, thing, equipment, apparatus) |
| roll(noun, swing, waver, sea) |
| scruple(noun, unstable, unsteady, vibrate) |
| seesaw(noun, swing, fluctuate, toy) |
| shilly-shally(noun, unstable, unsteady, vibrate) |
| stirrup link(noun, thing, equipment, apparatus) |
| swell(noun, swing, waver, sea) |
| swing arm(noun, thing, equipment, apparatus) |