knob
1 a round handle on a door or a drawer.
2 a round switch on a machine such as a radio that you use to turn it on and off, etc.
3 round shape like a ball on the surface or end of something.
4 a small piece of something such as butter.
with knobs on (idiom, slang, )
Used to say that something is a more complicated version of what you mention:
'It isn't art—it's just a horror movie with knobs on!'
