HUMDRUM is a playable word

humdrum Scrabble® Dictionary

noun
pl. humdrums
a dull, boring person
19 Playable Words can be made from "HUMDRUM"
   2-Letter Words (5 found)
   3-Letter Words (9 found)
   4-Letter Words (2 found)
   5-Letter Words (1 found)
   6-Letter Words (1 found)
   7-Letter Words (1 found)