UNTACKING is a playable word

untack Scrabble® Dictionary

verb
untacked, untacking, untacks
to remove a tack from
129 Playable Words can be made from "UNTACKING"
   2-Letter Words (15 found)
   5-Letter Words (13 found)
   7-Letter Words (5 found)
   8-Letter Words (1 found)
   9-Letter Words (1 found)