KNOBBED is a playable word

knob Scrabble® Dictionary

verb
knobbed, knobbing, knobs
to provide with a knob (a rounded protuberance)
48 Playable Words can be made from "KNOBBED"
   2-Letter Words (12 found)
   3-Letter Words (20 found)
   4-Letter Words (11 found)
   5-Letter Words (3 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)