BLUNDER is a playable word

blunder Scrabble® Dictionary

verb
blundered, blundering, blunders
to make a mistake
95 Playable Words can be made from "BLUNDER"
   2-Letter Words (10 found)
   3-Letter Words (29 found)
   5-Letter Words (13 found)
   6-Letter Words (7 found)
   7-Letter Words (2 found)