THRUM is a playable word

thrum Scrabble® Dictionary

verb
thrummed, thrumming, thrums
to play a stringed instrument idly or monotonously
15 Playable Words can be made from "THRUM"
   2-Letter Words (5 found)
   3-Letter Words (6 found)
   4-Letter Words (3 found)
   5-Letter Words (1 found)