KNOBS is a playable word

knob Scrabble® Dictionary

verb
knobbed, knobbing, knobs
to provide with a knob (a rounded protuberance)
22 Playable Words can be made from "KNOBS"
   2-Letter Words (6 found)
   3-Letter Words (8 found)
   4-Letter Words (6 found)
   5-Letter Words (2 found)