UNBUCKLE is a playable word

unbuckle Scrabble® Dictionary

verb
unbuckled, unbuckling, unbuckles
to loosen a buckle
48 Playable Words can be made from "UNBUCKLE"
   2-Letter Words (6 found)
   3-Letter Words (17 found)
   5-Letter Words (2 found)
   6-Letter Words (2 found)
   8-Letter Words (1 found)