Knob

1. A hard protuberance; a hard swelling or rising; a bunch; a lump; as, a knob in the flesh, or on a bone.
2. A knoblike ornament or handle; as, the knob of a lock, door, or drawer.
3. A rounded hill or mountain; as, the Pilot Knob.
4. To grow into knobs or bunches; to become knobbed.