Gears
Part of speech: noun
Definition: Equipment or paraphernalia, especially that used for an athletic endeavor.
Part of speech: verb
Definition: To provide with gearing; to fit with gears in order to achieve a desired gear ratio.
Sprocket
Part of speech: noun
Definition: A toothed wheel that enmeshes with a chain or other perforated band.The tooth of such a wheel.A flared extension at the base of a sloped roof.