SLUFF is a playable word

sluff Scrabble® Dictionary

verb
sluffed, sluffing, sluffs
to discard a card or cards
6 Playable Words can be made from "SLUFF"
   2-Letter Words (1 found)
   3-Letter Words (1 found)
   4-Letter Words (2 found)
   5-Letter Words (2 found)