knob

nouns

a circular rounded projection or protuberance
boss, knob
a round handle
knob
is a type of (narrower)
the appendage to an object that is designed to be held in order to use or move it
"he grabbed the hammer by the handle"; "it was an old briefcase but it still had a good grip"
grip, handgrip, handle, hold
any thickened enlargement
knob, node, thickening
is derived from
knobby
an ornament in the shape of a ball on the hilt of a sword or dagger
knob, pommel