You can use the word knob for any bump or bulge, like the egg shaped knob on your head after you bumped it on the door knob.
A hard protuberance; a hard swelling or rising; a bunch; a lump;
Noun
a round handle
Noun
a circular rounded projection or protuberance
Noun
an ornament in the shape of a ball on the hilt of a sword or dagger
Noun
any thickened enlargement
n.
A hard protuberance; a hard swelling or rising; a bunch; a
lump; as, a knob in the flesh, or on a bone.
n.
A knoblike ornament or handle; as, the knob of a lock, door,
or drawer.
n.
A rounded hill or mountain; as, the Pilot Knob.
n.
See Knop.
v. i.
To grow into knobs or bunches; to become knobbed.
Knob
Knob
A hard protuberance; a hard swelling or rising; a bunch; a lump;
To grow into knobs or bunches; to become knobbed.
Usage Examples
I hate modern car radios. In my car, I don't even have a push-button radio. It's just got a dial and two knobs. Just AM. One knob makes it louder, and one knob changes the station. When you're driving, that's all I want.
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