FLUSTER is a playable word

fluster Scrabble® Dictionary

verb
flustered, flustering, flusters
to put into a state of nervous confusion
108 Playable Words can be made from "FLUSTER"
   2-Letter Words (10 found)
   3-Letter Words (28 found)
   6-Letter Words (8 found)
   7-Letter Words (3 found)