TIGHTENING is a playable word

tighten Scrabble® Dictionary

verb
tightened, tightening, tightens
to make tight
102 Playable Words can be made from "TIGHTENING"
   2-Letter Words (11 found)
   3-Letter Words (28 found)
   6-Letter Words (9 found)
   8-Letter Words (2 found)
   10-Letter Words (1 found)